List of counties in Colorado

The U.S. state of Colorado is divided into 64 counties. Counties are important units of government in Colorado since there are no townships or other minor civil divisions. Two of these counties, Broomfield and Denver, have consolidated city and county governments.

Counties of Colorado
LocationState of Colorado
Number64
Populations699 (San Juan) – 622,263 (El Paso)
Areas34 square miles (88 km2) (Broomfield City and County) – 4,773.27 square miles (12,362.7 km2) (Las Animas)
GovernmentCounty government
Subdivisionscities, towns, unincorporated communities, census designated place

Colorado's ISO 3166-2:US state code is CO and its ANSI INCITS 38:2009 state code is 08.

When the Colorado Territory first began creating counties in 1861, 17 counties (Summit, Larimer, Weld, Boulder, Gilpin, Clear Creek, Jefferson, Arapahoe, Douglas, Lake, Conejos, Costilla, Park, Fremont, El Paso, Pueblo, and Huerfano) and a Cheyenne Reserve were formed.

In February 1866, the first new county, Las Animas, was created, followed by Saguache in December of that year. Bent County was created in February 1870, followed by Greenwood the following month. On February 2, 1874, Grand County and Elbert County were formed, and on February 10, La Plata, Hinsdale, and Rio Grande counties were created. Greenwood was absorbed into Bent on February 5. The last county to be created under the Colorado Territory name was San Juan County, created three months before statehood.

By the time Colorado became a state on August 1, 1876, it had only 26 counties. In January 1877, Routt and Ouray were formed, followed by Gunnison and Custer counties in March. In February 1879, Chaffee County was created. From February 8–10, 1879, Lake county was renamed Carbonate County. In 1881, Dolores County and Pitkin County were created. In 1883, Montrose, Mesa, Garfield, Eagle, Delta, and San Miguel counties were formed, leaving the total number of counties at 39. The number rose to 40 in 1885 with the creation of Archuleta County on April 14. Washington County and Logan County were both created in 1887. Between February 19 and April 16 in 1889, Morgan, Yuma, Cheyenne, Otero, Rio Blanco, Phillips, Sedgwick, Kiowa, Kit Carson, Lincoln, Prowers, Baca, and Montezuma counties were formed, bringing the total to 55. By 1900, Mineral County and Teller County had been added. On November 15, 1902, Arapahoe County was split into Adams and South Arapahoe Counties, and Denver was consolidated as a city-county from portions of both newly formed counties on December 1, 1902.[1] By 1912, Jackson County, Moffat County, and Crowley County had been created. Alamosa was created in 1913, and in 2001, Broomfield was recognized as a city-county, bringing the total to 64 counties.

Counties
County
 FIPS code[2][3] County seat[4][5] Est.[6] Formed from[6] Etymology[6] Population[7] Area[4] Map
Adams County 001 Brighton1902-11-15Split from Arapahoe County.Named in honor of Alva Adams, the 5th, 10th, and 14th Governor of the State of Colorado. 441,603 1,182.29 sq mi
(3,062 km2)
Alamosa County 003 Alamosa1913-03-08Split from Costilla County and Conejos County.Named for the cottonwood trees which grow along the Rio Grande and its tributaries. Alamosa is a Spanish word for a cottonwood grove. 15,445 723.21 sq mi
(1,873 km2)
Arapahoe County 005 Littleton1861-11-01Created as one of the 17 original counties of the Territory of Colorado. Renamed South Arapahoe County for the five months from November 15, 1902 to April 11, 1903.Named for predecessor Arapahoe County, Kansas Territory, which in turn was named for the Arapaho Nation of Native Americans. 572,003 804.41 sq mi
(2,083 km2)
Archuleta County 007 Pagosa Springs1885-04-14Split from Conejos County.Named in honor of Colorado State Senator Antonio D. Archuleta and his father, José Manuel Archuleta. 12,084 1,354.53 sq mi
(3,508 km2)
Baca County 009 Springfield1889-04-16Split from Las Animas County.Named in honor of pioneer and Colorado territorial legislator Felipe Baca. 3,788 2,558.48 sq mi
(6,626 km2)
Bent County 011 Las Animas1870-02-11Split from Huerfano County and former Cheyenne and Arapaho tribal land.Named in honor of frontier trader William Bent. 6,499 1,541.07 sq mi
(3,991 km2)
Boulder County 013 Boulder1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for the abundance of granite boulders along Boulder Creek. 294,567 740.48 sq mi
(1,918 km2)
City and County of Broomfield 014 Broomfield2001-11-15Split from Boulder, Adams, Jefferson, and Weld counties and reorganized as a consolidated city and county.Named for the broom corn that was formerly grown in the area. 55,889 33.57 sq mi
(87 km2)
Chaffee County 015 Salida1879-02-10Split from Carbonate County.Named in honor of Jerome Bunty Chaffee, one of Colorado's first two U.S. Senators from 1876 to 1879. 17,809 1,014.12 sq mi
(2,627 km2)
Cheyenne County 017 Cheyenne Wells1889-03-25Split from Elbert and Bent counties.Named for the Cheyenne Nation of Native Americans. 1,836 1,781.90 sq mi
(4,615 km2)
Clear Creek County 019 Georgetown1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for Clear Creek which originates in the county. 9,088 396.53 sq mi
(1,027 km2)
Conejos County 021 Conejos1861-11-01Guadalupe County, one of the 17 original counties of the Territory of Colorado, was renamed Conejos County after six days on November 7, 1861.Named for the cottontail rabbits in the area. Conejos is a Spanish word for rabbits. 8,256 1,290.22 sq mi
(3,342 km2)
Costilla County 023 San Luis1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for the Costilla River. Costilla is a Spanish word meaning either little rib or furring timber. 3,524 1,229.38 sq mi
(3,184 km2)
Crowley County 025 Ordway1911-05-29Split from Otero County.Named in honor of Colorado State Senator John H. Crowley. 5,823 800.27 sq mi
(2,073 km2)
Custer County 027 Westcliffe1877-03-09Split from Fremont County.Named in memory of George Armstrong Custer, (1839 - 1876), the U.S. Army colonel defeated and killed at the Battle of the Little Bighorn. 4,255 739.24 sq mi
(1,915 km2)
Delta County 029 Delta1883-02-11Split from Gunnison County.Named for the town of Delta located at the delta of the Uncompahgre River. 30,952 1,149.44 sq mi
(2,977 km2)
City and County of Denver 031 Denver1902-12-01The original Arapahoe County Seat was split from Arapahoe and the newly-created Adams Counties, and reorganized as a consolidated city and county.Named to curry favor with James W. Denver, Governor of the Territory of Kansas from 1857 to 1859. 600,158 155.66 sq mi
(403 km2)
Dolores County 033 Dove Creek1881-03-04Split from Ouray County.Named for the Dolores River, which was originally named el Rio de Nuestra Senora de los Dolores, which is Spanish for the River of our Lady of Sorrows. 2,064 1,076.93 sq mi
(2,789 km2)
Douglas County 035 Castle Rock1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named in honor of Stephen Arnold Douglas, (1813 - 1861), U.S. Senator from Illinois from 1847 to 1861. 285,465 842.30 sq mi
(2,182 km2)
Eagle County 037 Eagle1883-02-11Split from Summit County.Named for the Eagle River which originates in the county. 52,197 1,700.76 sq mi
(4,405 km2)
El Paso County 041 Colorado Springs1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for Ute Pass, which connects the Great Plains to South Park and was formerly located within the county. El Paso means the pass in Spanish. 622,263 2,128.60 sq mi
(5,513 km2)
Elbert County 039 Kiowa1874-02-02Split from Douglas County.Named in honor of Samuel Hitt Elbert, the sixth Governor of the Territory of Colorado. 23,086 1,849.08 sq mi
(4,789 km2)
Fremont County 043 Cañon City1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named in honor of John Charles Frémont (1813 - 1890), the explorer, U.S. Army general, and U.S. Senator from California. 46,824 1,533.09 sq mi
(3,971 km2)
Garfield County 045 Glenwood Springs1883-02-10Split from Summit County.Named in honor of James Abram Garfield (1831 - 1881), the twentieth President of the United States. 56,389 2,958.23 sq mi
(7,662 km2)
Gilpin County 047 Central City1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named in honor of William Gilpin, the first Governor of the Territory of Colorado. 5,441 150.15 sq mi
(389 km2)
Grand County 049 Hot Sulphur Springs1874-02-02Split from Summit County.Named for the Grand River which originates in the county. The Grand River was renamed the Colorado River in 1921, but the county retains the original name. 14,843 1,868.53 sq mi
(4,839 km2)
Gunnison County 051 Gunnison1877-03-09Split from Lake County.Named in honor of John Williams Gunnison, the U.S. Army captain who explored the region. 15,324 3,259.22 sq mi
(8,441 km2)
Hinsdale County 053 Lake City1874-02-10Split from Lake, Conejos, and Costilla counties.Named in honor of George Aaron Hinsdale, a Lieutenant Governor of the Territory of Colorado. 843 1,123.35 sq mi
(2,909 km2)
Huerfano County 055 Walsenburg1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for Huerfano Butte, a solitary volcanic plug. Huerfano is a Spanish word meaning orphan. 6,711 1,592.37 sq mi
(4,124 km2)
Jackson County 057 Walden1909-05-05Split from Larimer County.Named in honor of Andrew Jackson (1767 - 1845), the seventh President of the United States. 1,394 1,619.75 sq mi
(4,195 km2)
Jefferson County 059 Golden1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for its extralegal predecessor county, Jefferson County, Jefferson Territory, which in turn was named in honor of Thomas Jefferson (1743 - 1826), the author of the Declaration of Independence and the third President of the United States. 534,543 772.85 sq mi
(2,002 km2)
Kiowa County 061 Eads1889-04-11Split from Bent County.Named for the Kiowa Nation of Native Americans. 1,398 1,785.90 sq mi
(4,625 km2)
Kit Carson County 063 Burlington1889-04-11Split from Elbert County.Named in honor of Christopher Houston "Kit" Carson, the famous frontier scout and soldier. 8,270 2,162.43 sq mi
(5,601 km2)
La Plata County 067 Durango1874-02-10Split from Lake and Conejos counties.Named for the many silver deposits in the area. La plata is a Spanish expression for the silver. 51,334 1,700.44 sq mi
(4,404 km2)
Lake County 065 Leadville1861-11-01Created as one of the 17 original counties of the Territory of Colorado. Renamed Carbonate County for the two days from February 8–10, 1879.Named for the Twin Lakes in the county. 7,310 383.55 sq mi
(993 km2)
Larimer County 069 Fort Collins1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named in honor of William Larimer, a pioneer entrepreneur. 299,630 2,631.75 sq mi
(6,816 km2)
Las Animas County 071 Trinidad1866-02-09Split from Huerfano County.Named for the Purgatoire River, which was originally named el Rio de las Animas Perdidas, which is Spanish for the River of the Souls in Purgatory. 15,507 4,773.27 sq mi
(12,363 km2)
Lincoln County 073 Hugo1889-04-11Split from Elbert and Bent counties.Named in honor of Abraham Lincoln (1809 - 1865), the sixteenth President of the United States. 5,467 2,585.21 sq mi
(6,696 km2)
Logan County 075 Sterling1887-02-25Split from Weld County.Named in honor of John Alexander Logan (1826 - 1886), a U.S. Army general and U.S. Senator from Illinois. 22,709 1,845.31 sq mi
(4,779 km2)
Mesa County 077 Grand Junction1883-02-14Split from Gunnison County.Named for the mesa formations which are widespread through the area. 146,723 3,345.69 sq mi
(8,665 km2)
Mineral County 079 Creede1893-03-27Split from Hinsdale, Rio Grande, and Saguache counties.Named from the plentiful mineral deposits found in the area. 712 878.16 sq mi
(2,274 km2)
Moffat County 081 Craig1911-02-27Split from Routt County.Named in honor of railroad pioneer David H. Moffat. 13,795 4,755.86 sq mi
(12,318 km2)
Montezuma County 083 Cortez1889-04-16Split from La Plata County.Named in honor of Aztec leader Moctezuma II. Ruins in the area were once thought to be Aztec. 25,535 2,035.80 sq mi
(5,273 km2)
Montrose County 085 Montrose1883-02-11Split from Gunnison County.Named for the town of Montrose, which in turn was probably named from the novel A Legend of Montrose, published in 1819 by Walter Scott. 41,276 2,246.43 sq mi
(5,818 km2)
Morgan County 087 Fort Morgan1889-02-19Split from Weld County.Named for old Fort Morgan, which in turn was named in honor of U.S. Army Colonel Christopher A. Morgan. 28,159 1,293.83 sq mi
(3,351 km2)
Otero County 089 La Junta1889-03-25Split from Bent County.Named in honor of Miguel A. Otero of the prominent Otero family of the Southwest. 18,831 1,267.66 sq mi
(3,283 km2)
Ouray County 091 Ouray1877-01-18Split from Hinsdale and Lake counties. Renamed Uncompaghre County for four days from 1883-02-27, to 1883-03-02.Named in honor of Ouray, a Ute Native American leader. 4,436 542.30 sq mi
(1,405 km2)
Park County 093 Fairplay1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for South Park which occupies most of the county. 16,206 2,209.36 sq mi
(5,722 km2)
Phillips County 095 Holyoke1889-03-27Split from Logan County.Named in honor of R.O. Phillips, secretary of the Lincoln Land Company, which sold farmsteads in the area. 4,442 688.30 sq mi
(1,783 km2)
Pitkin County 097 Aspen1881-02-23Split from Gunnison County.Named in honor of Frederick Walker Pitkin, the second Governor of the State of Colorado. 17,148 970.37 sq mi
(2,513 km2)
Prowers County 099 Lamar1889-04-11Split from Bent County.Named in honor of John W. Prowers, a pioneer of the Arkansas River valley. 12,551 1,645.37 sq mi
(4,261 km2)
Pueblo County 101 Pueblo1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for historic town of Pueblo. Pueblo is a Spanish word meaning village or people. 159,063 2,396.77 sq mi
(6,208 km2)
Rio Blanco County 103 Meeker1889-03-25Split from Garfield County.Named for the White River, which was originally named Rio Blanco in Spanish. 6,666 3,226.24 sq mi
(8,356 km2)
Rio Grande County 105 Del Norte1874-02-10Split from Costilla County and Conejos County counties.Named for the Rio Grande, which flows through the area. 11,982 913.10 sq mi
(2,365 km2)
Routt County 107 Steamboat Springs1877-01-29Split from Grand County.Named in honor of John Long Routt, the first Governor of the State of Colorado. 23,509 2,362.11 sq mi
(6,118 km2)
Saguache County 109 Saguache1866-12-29Split from Lake and Costilla counties.Name comes from a Ute language noun meaning "sand dunes".[8][9] 6,108 3,168.32 sq mi
(8,206 km2)
San Juan County 111 Silverton1876-01-31Split from Lake County.Named for the San Juan River and San Juan Mountains, which in turn were named for Saint John the Evangelist. 699 388.99 sq mi
(1,007 km2)
San Miguel County 113 Telluride1883-03-02Split from San Juan County.Named for the San Miguel River and San Miguel Mountains, which in turn were named for Saint Michael the Archangel. 7,359 1,290.76 sq mi
(3,343 km2)
Sedgwick County 115 Julesburg1889-04-09Split from Logan County.Named for Fort Sedgwick, which, in turn, was named for U.S. Army General John Sedgwick (1813 - 1864). 2,379 548.83 sq mi
(1,421 km2)
Summit County 117 Breckenridge1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named for the many high mountain summits in the area. 27,994 618.92 sq mi
(1,603 km2)
Teller County 119 Cripple Creek1899-03-23Split from El Paso and Fremont counties.Named in honor of Henry Moore Teller, a U.S. Senator from Colorado and United States Secretary of the Interior. 23,350 558.58 sq mi
(1,447 km2)
Washington County 121 Akron1887-02-09Split from Weld County.Named in honor of George Washington (1732 - 1799), the first President of the United States. 4,814 2,522.90 sq mi
(6,534 km2)
Weld County 123 Greeley1861-11-01Created as one of the 17 original counties of the Territory of Colorado.Named in honor of Lewis Ledyard Weld, the first Secretary of the Territory of Colorado. 252,825 4,013.84 sq mi
(10,396 km2)
Yuma County 125 Wray1889-03-15Split from Washington County.Named for the Quechan (Yuma) Nation of Native Americans. 10,043 2,369.61 sq mi
(6,137 km2)

Table 2
An enlargeable map of the 64 counties of the state of Colorado

The following sortable table lists the 64 counties of the state of Colorado with the following information:

  1. The official name of the county,[10]
  2. The International Committee for Information Technology Standards (INCITS) county code.[11]
  3. The date the county was established,[12]
  4. The county seat,[13]
  5. The rank among the 64 counties of Colorado by population as of July 1, 2013, as estimated by the United States Census Bureau,[11]
  6. The county population as of July 1, 2013, as estimated by the United States Census Bureau,[11]
  7. The county population as of April 1, 2010, as enumerated by the 2010 United States Census,[11]
  8. The percent population change from April 1, 2010, to July 1, 2013,[11]
  9. A link to a detailed transportation map of the county.[14]
  10. The average population density per land area of the county as of July 1, 2012,[11]
  11. The land area of the county,[11]
  12. The water area of the county,[11]
  13. The total area of the county,[11]
  14. The maximum surface elevation in the county,[15][16][17]
  15. The minimum surface elevation in the county,[17][18][19]
  16. The reference latitude of the county,[11] and
  17. The reference longitude of the county.[11]
The 64 Counties of the State of Colorado
County INCITS Date Established County Seat Pop Rank 2013 Pop 2010 Census Pop Change Map Pop Density Land Area Water Area Total Area Max Elev Min Elev Latitude Longitude
Adams County 08001 1902-11-15 Brighton 5 469,193 441,603 +6.25% map 393.6 mi−2
152.0 km−2		 1,167.653 mi2
3,024.208 km2		 16.243 mi2
42.070 km2		 1,183.897 mi2
3,066.278 km2		 5,668 ft
1728 m		 4,432 ft
1351 m		 39.87° N 104.33° W
Alamosa County 08003 1913-03-08 Alamosa 29 16,253 15,445 +5.23% map 21.4 mi−2
8.3 km−2		 722.643 mi2
1,871.637 km2		 0.698 mi2
1.808 km2		 723.341 mi2
1,873.445 km2		 14,351 ft
4374 m		 6,387 ft
1947 m		 37.57° N 105.79° W
Arapahoe County 08005 1861-11-01 Littleton 3 607,070 572,003 +6.13% map 716.7 mi−2
276.7 km−2		 798.100 mi2
2,067.070 km2		 7.337 mi2
19.004 km2		 805.438 mi2
2,086.074 km2		 6,218 ft
1895 m		 4,730 ft
1442 m		 39.64° N 104.33° W
Archuleta County 08007 1885-04-14 Pagosa Springs 36 12,194 12,084 +0.91% map 8.9 mi−2
3.5 km−2		 1,350.175 mi2
3,496.938 km2		 5.339 mi2
13.828 km2		 1,355.514 mi2
3,510.765 km2		 13,308 ft
4056 m		 6,085 ft
1855 m		 37.20° N 107.05° W
Baca County 08009 1889-04-16 Springfield 55 3,682 3,788 −2.80% map 1.5 mi−2
0.6 km−2		 2,554.967 mi2
6,617.334 km2		 2.372 mi2
6.142 km2		 2,557.338 mi2
6,623.476 km2		 5,293 ft
1613 m		 3,458 ft
1054 m		 37.30° N 102.54° W
Bent County 08011 1870-02-11 Las Animas 47 5,688 6,499 −12.48% map 4.3 mi−2
1.7 km−2		 1,512.861 mi2
3,918.292 km2		 28.222 mi2
73.094 km2		 1,541.083 mi2
3,991.386 km2		 4,857 ft
1481 m		 3,671 ft
1119 m		 37.93° N 103.08° W
Boulder County 08013 1861-11-01 Boulder 7 310,048 294,567 +5.26% map 405.6 mi−2
156.6 km−2		 726.289 mi2
1,881.080 km2		 14.081 mi2
36.469 km2		 740.370 mi2
1,917.549 km2		 14,259 ft
4346 m		 4,717 ft
1438 m		 40.09° N 105.40° W
City and County of Broomfield 08014 2001-11-15 Broomfield 12 59,471 55,889 +6.41% map 1,691.9 mi−2
653.2 km−2		 33.034 mi2
85.558 km2		 0.566 mi2
1.466 km2		 33.600 mi2
87.024 km2		 5,848 ft
1783 m		 4,691 ft
1430 m		 39.95° N 105.05° W
Chaffee County 08015 1879-02-10 Salida 27 18,510 17,809 +3.94% map 17.6 mi−2
6.8 km−2		 1,013.403 mi2
2,624.702 km2		 1.550 mi2
4.013 km2		 1,014.953 mi2
2,628.716 km2		 14,427 ft
4397 m		 5,298 ft
1615 m		 38.74° N 106.32° W
Cheyenne County 08017 1889-03-25 Cheyenne Wells 59 1,890 1,836 +2.94% map 1.0 mi−2
0.4 km−2		 1,778.276 mi2
4,605.713 km2		 3.153 mi2
8.166 km2		 1,781.429 mi2
4,613.879 km2		 5,257 ft
1602 m		 3,740 ft
1140 m		 38.84° N 102.60° W
Clear Creek County 08019 1861-11-01 Georgetown 39 9,031 9,088 −0.63% map 23.0 mi−2
8.9 km−2		 395.227 mi2
1,023.633 km2		 1.266 mi2
3.280 km2		 396.493 mi2
1,026.913 km2		 14,278 ft
4352 m		 5,075 ft
1547 m		 39.69° N 105.67° W
Conejos County 08021 1861-11-07 Conejos 40 8,277 8,256 +0.25% map 6.4 mi−2
2.5 km−2		 1,287.391 mi2
3,334.326 km2		 3.566 mi2
9.235 km2		 1,290.956 mi2
3,343.561 km2		 13,179 ft
4017 m		 7,404 ft
2257 m		 37.21° N 106.18° W
Costilla County 08023 1861-11-01 San Luis 56 3,518 3,524 −0.17% map 2.9 mi−2
1.1 km−2		 1,226.952 mi2
3,177.790 km2		 3.409 mi2
8.829 km2		 1,230.360 mi2
3,186.619 km2		 14,351 ft
4374 m		 7,375 ft
2248 m		 37.28° N 105.43° W
Crowley County 08025 1911-05-29 Ordway 50 5,322 5,823 −8.60% map 7.4 mi−2
2.9 km−2		 787.421 mi2
2,039.411 km2		 12.908 mi2
33.430 km2		 800.329 mi2
2,072.842 km2		 5,228 ft
1593 m		 3,966 ft
1209 m		 38.32° N 103.79° W
Custer County 08027 1877-03-09 Westcliffe 54 4,285 4,255 +0.71% map 5.8 mi−2
2.2 km−2		 738.625 mi2
1,913.031 km2		 1.299 mi2
3.365 km2		 739.925 mi2
1,916.396 km2		 14,246 ft
4342 m		 4,547 ft
1386 m		 38.10° N 105.37° W
Delta County 08029 1883-02-11 Delta 18 30,483 30,952 −1.52% map 27.1 mi−2
10.5 km−2		 1,142.050 mi2
2,957.897 km2		 6.549 mi2
16.961 km2		 1,148.599 mi2
2,974.858 km2		 11,396 ft
3474 m		 4,763 ft
1452 m		 38.86° N 107.86° W
City and County of Denver 08031 1902-12-01 Denver 2 649,495 600,158 +8.22% map 3,922.6 mi−2
1,514.5 km−2		 153.000 mi2
396.269 km2		 1.631 mi2
4.225 km2		 154.632 mi2
400.494 km2		 5,688 ft
1734 m		 4,803 ft
1464 m		 39.76° N 104.88° W
Dolores County 08033 1881-03-04 Dove Creek 58 2,029 2,064 −1.70% map 1.9 mi−2
0.7 km−2		 1,067.051 mi2
2,763.650 km2		 1.049 mi2
2.716 km2		 1,068.100 mi2
2,766.366 km2		 14,252 ft
4344 m		 4,911 ft
1497 m		 37.75° N 108.53° W
Douglas County 08035 1861-11-01 Castle Rock 8 305,963 285,465 +7.18% map 339.7 mi−2
131.2 km−2		 840.248 mi2
2,176.232 km2		 2.621 mi2
6.789 km2		 842.869 mi2
2,183.022 km2		 9,836 ft
2998 m		 5,242 ft
1598 m		 39.33° N 104.93° W
Eagle County 08037 1883-02-11 Eagle 15 52,460 52,197 +0.50% map 31.0 mi−2
12.0 km−2		 1,684.530 mi2
4,362.912 km2		 7.261 mi2
18.806 km2		 1,691.791 mi2
4,381.718 km2		 14,011 ft
4271 m		 6,220 ft
1896 m		 39.63° N 106.69° W
Elbert County 08039 1874-02-02 Kiowa 22 23,733 23,086 +2.80% map 12.5 mi−2
4.8 km−2		 1,850.847 mi2
4,793.671 km2		 0.171 mi2
0.442 km2		 1,851.018 mi2
4,794.113 km2		 7,374 ft
2248 m		 4,580 ft
1396 m		 39.31° N 104.12° W
El Paso County 08041 1861-11-01 Colorado Springs 1 655,044 622,263 +5.27% map 292.6 mi−2
113.0 km−2		 2,126.801 mi2
5,508.390 km2		 2.746 mi2
7.112 km2		 2,129.547 mi2
5,515.501 km2		 14,115 ft
4302 m		 5,055 ft
1541 m		 38.83° N 104.53° W
Fremont County 08043 1861-11-01 Cañon City 16 46,451 46,824 −0.80% map 30.5 mi−2
11.8 km−2		 1,533.068 mi2
3,970.627 km2		 0.863 mi2
2.235 km2		 1,533.931 mi2
3,972.863 km2		 13,110 ft
3996 m		 4,573 ft
1394 m		 38.46° N 105.42° W
Garfield County 08045 1883-02-10 Glenwood Springs 13 57,302 56,389 +1.62% map 19.1 mi−2
7.4 km−2		 2,947.563 mi2
7,634.154 km2		 8.274 mi2
21.431 km2		 2,955.838 mi2
7,655.584 km2		 12,361 ft
3768 m		 4,471 ft
1363 m		 39.60° N 107.91° W
Gilpin County 08047 1861-11-01 Central City 48 5,601 5,441 +2.94% map 36.3 mi−2
14.0 km−2		 149.896 mi2
388.229 km2		 0.364 mi2
0.942 km2		 150.260 mi2
389.171 km2		 13,300 ft
4054 m		 4,983 ft
1519 m		 39.86° N 105.53° W
Grand County 08049 1874-02-02 Hot Sulphur Springs 33 14,289 14,843 −3.73% map 8.0 mi−2
3.1 km−2		 1,846.330 mi2
4,781.972 km2		 23.263 mi2
60.250 km2		 1,869.592 mi2
4,842.222 km2		 13,559 ft
4133 m		 6,040 ft
1841 m		 40.12° N 106.10° W
Gunnison County 08051 1877-03-09 Gunnison 31 15,507 15,324 +1.19% map 4.7 mi−2
1.8 km−2		 3,239.099 mi2
8,389.229 km2		 20.530 mi2
53.172 km2		 3,259.629 mi2
8,442.401 km2		 14,279 ft
4352 m		 7,178 ft
2188 m		 38.67° N 107.08° W
Hinsdale County 08053 1874-02-10 Lake City 62 813 843 −3.56% map 0.8 mi−2
0.3 km−2		 1,117.251 mi2
2,893.668 km2		 5.917 mi2
15.325 km2		 1,123.168 mi2
2,908.992 km2		 14,321 ft
4365 m		 7,299 ft
2225 m		 37.81° N 107.38° W
Huerfano County 08055 1861-11-01 Walsenburg 45 6,519 6,711 −2.86% map 4.2 mi−2
1.6 km−2		 1,591.001 mi2
4,120.673 km2		 2.236 mi2
5.792 km2		 1,593.237 mi2
4,126.465 km2		 14,326 ft
4366 m		 4,445 ft
1355 m		 37.69° N 104.96° W
Jackson County 08057 1909-05-05 Walden 61 1,365 1,394 −2.08% map 0.9 mi−2
0.3 km−2		 1,613.723 mi2
4,179.523 km2		 7.239 mi2
18.750 km2		 1,620.962 mi2
4,198.273 km2		 12,954 ft
3948 m		 4,865 ft
1483 m		 40.66° N 106.33° W
Jefferson County 08059 1861-11-01 Golden 4 551,798 534,543 +3.23% map 699.5 mi−2
270.1 km−2		 764.208 mi2
1,979.290 km2		 9.825 mi2
25.446 km2		 774.033 mi2
2,004.736 km2		 11,589 ft
3532 m		 4,986 ft
1520 m		 39.59° N 105.25° W
Kiowa County 08061 1889-04-11 Eads 60 1,423 1,398 +1.79% map 0.8 mi−2
0.3 km−2		 1,767.767 mi2
4,578.496 km2		 18.160 mi2
47.033 km2		 1,785.927 mi2
4,625.529 km2		 4,697 ft
1432 m		 3,687 ft
1124 m		 38.39° N 102.76° W
Kit Carson County 08063 1889-04-11 Burlington 41 8,037 8,270 −2.82% map 3.8 mi−2
1.5 km−2		 2,160.822 mi2
5,596.502 km2		 0.869 mi2
2.252 km2		 2,161.691 mi2
5,598.754 km2		 5,297 ft
1615 m		 3,523 ft
1074 m		 39.31° N 102.60° W
Lake County 08065 1861-11-01 Leadville 43 7,306 7,310 −0.05% map 19.4 mi−2
7.5 km−2		 376.911 mi2
976.194 km2		 6.998 mi2
18.124 km2		 383.909 mi2
994.319 km2		 14,440 ft
4401 m		 8,720 ft
2658 m		 39.20° N 106.35° W
La Plata County 08067 1874-02-10 Durango 14 53,284 51,334 +3.80% map 30.3 mi−2
11.7 km−2		 1,692.078 mi2
4,382.463 km2		 7.629 mi2
19.760 km2		 1,699.708 mi2
4,402.223 km2		 14,093 ft
4296 m		 4,268 ft
1301 m		 37.29° N 107.84° W
Larimer County 08069 1861-11-01 Fort Collins 6 315,988 299,630 +5.46% map 115.4 mi−2
44.6 km−2		 2,596.002 mi2
6,723.613 km2		 37.952 mi2
98.295 km2		 2,633.954 mi2
6,821.909 km2		 13,573 ft
4137 m		 4,557 ft
1389 m		 40.66° N 105.48° W
Las Animas County 08071 1866-02-09 Trinidad 32 14,446 15,507 −6.84% map 3.2 mi−2
1.3 km−2		 4,772.671 mi2
12,361.162 km2		 2.676 mi2
6.930 km2		 4,775.347 mi2
12,368.092 km2		 13,631 ft
4155 m		 4,317 ft
1316 m		 37.32° N 104.04° W
Lincoln County 08073 1889-04-11 Hugo 49 5,430 5,467 −0.68% map 2.1 mi−2
0.8 km−2		 2,577.626 mi2
6,676.021 km2		 8.796 mi2
22.781 km2		 2,586.422 mi2
6,698.802 km2		 5,973 ft
1821 m		 3,923 ft
1196 m		 38.99° N 103.51° W
Logan County 08075 1887-02-25 Sterling 25 22,450 22,709 −1.14% map 12.4 mi−2
4.8 km−2		 1,838.546 mi2
4,761.813 km2		 6.318 mi2
16.364 km2		 1,844.864 mi2
4,778.177 km2		 4,947 ft
1508 m		 3,428 ft
1045 m		 40.73° N 103.09° W
Mesa County 08077 1883-02-14 Grand Junction 11 147,554 146,723 +0.57% map 44.1 mi−2
17.0 km−2		 3,328.974 mi2
8,622.003 km2		 12.149 mi2
31.467 km2		 3,341.123 mi2
8,653.470 km2		 11,236 ft
3425 m		 4,337 ft
1322 m		 39.02° N 108.46° W
Mineral County 08079 1893-03-27 Creede 63 721 712 +1.26% map 0.8 mi−2
0.3 km−2		 875.666 mi2
2,267.966 km2		 2.016 mi2
5.222 km2		 877.683 mi2
2,273.188 km2		 13,902 ft
4237 m		 7,549 ft
2301 m		 37.65° N 106.93° W
Moffat County 08081 1911-02-27 Craig 34 13,103 13,795 −5.02% map 2.9 mi−2
1.1 km−2		 4,743.290 mi2
12,285.065 km2		 7.622 mi2
19.742 km2		 4,750.912 mi2
12,304.807 km2		 10,840 ft
3304 m		 4,993 ft
1522 m		 40.57° N 108.20° W
Montezuma County 08083 1889-04-16 Cortez 21 25,642 25,535 +0.42% map 12.6 mi−2
4.9 km−2		 2,029.527 mi2
5,256.451 km2		 10.624 mi2
27.517 km2		 2,040.151 mi2
5,283.968 km2		 13,237 ft
4035 m		 4,639 ft
1414 m		 37.34° N 108.60° W
Montrose County 08085 1883-02-11 Montrose 17 40,713 41,276 −1.36% map 18.4 mi−2
7.1 km−2		 2,240.695 mi2
5,803.373 km2		 1.901 mi2
4.923 km2		 2,242.596 mi2
5,808.296 km2		 11,453 ft
3491 m		 4,711 ft
1436 m		 38.41° N 108.26° W
Morgan County 08087 1889-02-19 Fort Morgan 20 28,404 28,159 +0.87% map 22.0 mi−2
8.5 km−2		 1,280.433 mi2
3,316.305 km2		 13.310 mi2
34.474 km2		 1,293.743 mi2
3,350.779 km2		 4,937 ft
1505 m		 3,989 ft
1216 m		 40.26° N 103.81° W
Otero County 08089 1889-03-25 La Junta 26 18,703 18,831 −0.68% map 14.9 mi−2
5.8 km−2		 1,261.961 mi2
3,268.465 km2		 7.742 mi2
20.052 km2		 1,269.704 mi2
3,288.518 km2		 5,273 ft
1607 m		 3,809 ft
1161 m		 37.88° N 103.72° W
Ouray County 08091 1877-01-18 Ouray 52 4,557 4,436 +2.73% map 8.2 mi−2
3.2 km−2		 541.593 mi2
1,402.719 km2		 0.618 mi2
1.600 km2		 542.210 mi2
1,404.318 km2		 14,158 ft
4315 m		 6,315 ft
1925 m		 38.15° N 107.77° W
Park County 08093 1861-11-01 Fairplay 30 16,121 16,206 −0.52% map 7.4 mi−2
2.9 km−2		 2,193.846 mi2
5,682.034 km2		 16.807 mi2
43.531 km2		 2,210.653 mi2
5,725.565 km2		 14,293 ft
4357 m		 5,826 ft
1776 m		 39.12° N 105.72° W
Phillips County 08095 1889-03-27 Holyoke 53 4,356 4,442 −1.94% map 6.5 mi−2
2.5 km−2		 687.928 mi2
1,781.725 km2		 0.117 mi2
0.302 km2		 688.044 mi2
1,782.027 km2		 4,117 ft
1255 m		 3,582 ft
1092 m		 40.59° N 102.35° W
Pitkin County 08097 1881-02-23 Aspen 28 17,379 17,148 +1.35% map 17.7 mi−2
6.8 km−2		 970.697 mi2
2,514.094 km2		 2.498 mi2
6.469 km2		 973.195 mi2
2,520.564 km2		 14,279 ft
4352 m		 5,695 ft
1736 m		 39.22° N 106.92° W
Prowers County 08099 1889-04-11 Lamar 35 12,291 12,551 −2.07% map 7.7 mi−2
3.0 km−2		 1,638.394 mi2
4,243.422 km2		 5.928 mi2
15.353 km2		 1,644.322 mi2
4,258.775 km2		 4,713 ft
1437 m		 3,346 ft
1020 m		 37.96° N 102.39° W
Pueblo County 08101 1861-11-01 Pueblo 10 161,451 159,063 +1.50% map 66.7 mi−2
25.7 km−2		 2,386.104 mi2
6,179.981 km2		 11.691 mi2
30.280 km2		 2,397.795 mi2
6,210.261 km2		 12,352 ft
3765 m		 4,291 ft
1308 m		 38.17° N 104.49° W
Rio Blanco County 08103 1889-03-25 Meeker 44 6,807 6,666 +2.12% map 2.1 mi−2
0.8 km−2		 3,220.933 mi2
8,342.179 km2		 1.880 mi2
4.868 km2		 3,222.813 mi2
8,347.047 km2		 12,033 ft
3668 m		 5,062 ft
1543 m		 39.97° N 108.20° W
Rio Grande County 08105 1874-02-10 Del Norte 37 11,803 11,982 −1.49% map 13.1 mi−2
5.1 km−2		 911.958 mi2
2,361.960 km2		 0.380 mi2
0.984 km2		 912.338 mi2
2,362.944 km2		 13,209 ft
4026 m		 7,467 ft
2276 m		 37.49° N 106.45° W
Routt County 08107 1877-01-29 Steamboat Springs 23 23,513 23,509 +0.02% map 10.0 mi−2
3.8 km−2		 2,362.026 mi2
6,117.619 km2		 6.110 mi2
15.826 km2		 2,368.136 mi2
6,133.445 km2		 12,185 ft
3714 m		 6,266 ft
1910 m		 40.48° N 106.99° W
Saguache County[8][9] 08109 1866-12-29 Saguache 46 6,208 6,108 +1.64% map 1.9 mi−2
0.7 km−2		 3,168.524 mi2
8,206.441 km2		 1.720 mi2
4.455 km2		 3,170.244 mi2
8,210.895 km2		 14,300 ft
4359 m		 6,013 ft
1833 m		 38.03° N 106.25° W
San Juan County 08111 1876-01-31 Silverton 64 692 699 −1.00% map 1.8 mi−2
0.7 km−2		 387.488 mi2
1,003.588 km2		 0.786 mi2
2.036 km2		 388.274 mi2
1,005.624 km2		 13,900 ft
4237 m		 7,683 ft
2342 m		 37.78° N 107.67° W
San Miguel County 08113 1883-03-02 Telluride 42 7,678 7,359 +4.33% map 5.7 mi−2
2.2 km−2		 1,286.611 mi2
3,332.308 km2		 2.013 mi2
5.214 km2		 1,288.625 mi2
3,337.522 km2		 14,023 ft
4274 m		 5,308 ft
1618 m		 38.01° N 108.43° W
Sedgwick County 08115 1889-04-09 Julesburg 57 2,360 2,379 −0.80% map 4.3 mi−2
1.7 km−2		 548.041 mi2
1,419.419 km2		 1.363 mi2
3.531 km2		 549.404 mi2
1,422.950 km2		 4,127 ft
1258 m		 3,477 ft
1060 m		 40.87° N 102.36° W
Summit County 08117 1861-11-01 Breckenridge 19 28,649 27,994 +2.34% map 46.0 mi−2
17.8 km−2		 608.358 mi2
1,575.639 km2		 10.920 mi2
28.283 km2		 619.278 mi2
1,603.922 km2		 14,278 ft
4352 m		 7,460 ft
2274 m		 39.62° N 106.14° W
Teller County 08119 1899-03-23 Cripple Creek 24 23,275 23,350 −0.32% map 41.9 mi−2
16.2 km−2		 557.055 mi2
1,442.767 km2		 1.909 mi2
4.945 km2		 558.965 mi2
1,447.712 km2		 13,065 ft
3982 m		 5,236 ft
1596 m		 38.87° N 105.18° W
Washington County 08121 1887-02-09 Akron 51 4,803 4,814 −0.23% map 1.9 mi−2
0.7 km−2		 2,518.031 mi2
6,521.670 km2		 5.872 mi2
15.207 km2		 2,523.903 mi2
6,536.878 km2		 5,433 ft
1656 m		 3,910 ft
1192 m		 39.97° N 103.21° W
Weld County 08123 1861-11-01 Greeley 9 269,785 252,825 +6.71% map 63.4 mi−2
24.5 km−2		 3,987.238 mi2
10,326.899 km2		 29.558 mi2
76.554 km2		 4,016.796 mi2
10,403.453 km2		 6,388 ft
1947 m		 3,959 ft
1207 m		 40.56° N 104.38° W
Yuma County 08125 1889-03-15 Wray 38 10,151 10,043 +1.08% map 4.2 mi−2
1.6 km−2		 2,364.405 mi2
6,123.780 km2		 4.299 mi2
11.135 km2		 2,368.704 mi2
6,134.915 km2		 4,447 ft
1355 m		 3,317 ft
1011 m		 40.00° N 102.42° W
State of Colorado 08 1876-08-01 Denver 5,268,367 5,029,196 +4.76% map 48.5 mi−2
18.7 km−2		 103,641.884 mi2
268,431.246 km2		 451.779 mi2
1,170.101 km2		 104,093.662 mi2
269,601.348 km2		 14,440 ft
4401 m		 3,317 ft
1011 m		 38.99° N 105.51° W

County high points
Main article: List of Colorado county high points

Former counties

The sortable table below lists all the historic counties of the Territory of New Mexico, the Territory of Utah, the Territory of Kansas, and the extralegal Territory of Jefferson[20] that previously existed within the boundaries of the present State of Colorado, as well as the three defunct counties of the Territory of Colorado and the three defunct counties of the State of Colorado. The table includes the following information:

  1. The official name of the county,
  2. The territory or state,
  3. The date the county was created,
  4. The date the county was abolished or excluded from the new Territory of Colorado, and
  5. Historical notes.
Counties formerly within the area of the State of Colorado
County Territory or State Created Superseded History
Taos County Territory of New Mexico 185201091852-01-09 186102281861-02-28 Originally one of the seven partidos of the Spanish, and later Mexican, province of Santa Fe de Nuevo México. One of the nine original counties created by the Territory of New Mexico in 1852. Excluded from the new Territory of Colorado in 1861.
Great Salt Lake County Territory of Utah 185203031852-03-03 186102281861-02-28 Created in 1852, and excluded from the new Territory of Colorado in 1861.
Green River County Territory of Utah 185203031852-03-03 186102281861-02-28 Created in 1852, but never organized. Dissolved in 1857, but recreated in 1859. Excluded from the new Territory of Colorado in 1861, and the Territory of Wyoming in 1868. Finally dissolved in 1872.
Iron County Territory of Utah 185203031852-03-03 186102281861-02-28 Created in 1852, and excluded from the new Territory of Colorado in 1861.
Sanpete County Territory of Utah 185203031852-03-03 186102281861-02-28 Created in 1852, and excluded from the new Territory of Colorado in 1861.
Utah County Territory of Utah 185203031852-03-03 186102281861-02-28 Created in 1852, and excluded from the new Territory of Colorado in 1861.
Washington County Territory of Utah 185203031852-03-03 186102281861-02-28 Created in 1852, and excluded from the new Territory of Colorado in 1861.
Arapahoe County Territory of Kansas 185508251855-08-25 186101291861-01-29 Created in 1855, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Beaver County Territory of Utah 185601051856-01-05 186102281861-02-28 Split from Iron and Millard counties in 1856. Excluded from the new Territory of Colorado in 1861.
Broderick County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
El Paso County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Fremont County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Montana County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Oro County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Peketon County Territory of Kansas 185902071859-02-07 186101291861-01-29 Created in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Arrappahoe County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Cheyenne County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
El Paso County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Fountain County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Heele County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Jackson County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Jefferson County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Mountain County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
North County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Park County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Saint Vrain CountySt. Vrain County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Saratoga County Territory of Jefferson 185911281859-11-28 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Mora County Territory of New Mexico 186002011860-02-01 186102281861-02-28 Split from Taos County and San Miguel County in 1860. Excluded from the new Territory of Colorado in 1861.
Guadalupe County Territory of Colorado 186111011861-11-01 186111071861-11-07 One of the 17 original counties created by the Territory of Colorado in 1861. The county was renamed Conejos County after only six days.
Greenwood County Territory of Colorado 187002111870-02-11 187402061874-02-06 Created from former Cheyenne and Arapaho tribal land and the eastern portion of Huerfano County in 1870. The county was abolished in 1874 and its territory split between Elbert County and Bent County.
Platte County Territory of Colorado 187202091872-02-09 187402091874-02-09 Created from the eastern portion of Weld County in 1872. The county was abolished in 1874 after organizers failed to secure voter approval. The territory of the county was returned to Weld County.
Carbonate County State of Colorado 187902081879-02-08 187902101879-02-10 Lake County was renamed Carbonate County in 1879. Only two days later, Carbonate County was split into the new Chaffee County and a recreated Lake County.
Uncompahgre County State of Colorado 188302271883-02-27 188303021883-03-02 Ouray County was renamed Uncompahgre County for only four days in 1883.
South Arapahoe County State of Colorado 190211151902-11-15 190304111903-04-11 One of three counties created from Arapahoe County in 1902. The name was changed back to Arapahoe County after five months.

No organized counties of the District of Louisiana, the Territory of Missouri, the extralegal State of Deseret, or the Territory of Nebraska existed within the present boundaries of the state of Colorado.

County distinctions
1. Costilla County was the first area within the present State of Colorado to be settled by Europeans in 1851.
2. Taos County, created by the Territory of New Mexico in 1852, was the first organized county to extend into the area of the present State of Colorado.
3. Arapahoe County, created by the Territory of Kansas in 1855, was the first county created exclusively within the area of the present State of Colorado.
4. On November 28, 1859, the extralegal Territory of Jefferson created 12 counties:[20]
The 12 counties of the
Territory of Jefferson
County County Seat
Arrappahoe County Denver City
Cheyenne County
El Paso County Colorado City
Fountain County Pueblo
Heele County La Porte
Jackson County Boulder City
Jefferson County Arapahoe City
Golden City
Mountain County Central City
North County
Park County Tarryall City
Saint Vrain's CountySt. Vrain's County Saint VrainSt. Vrain
Saratoga County Breckinridge
5. On November 1, 1861, the Territory of Colorado created the 17 original Colorado counties:[12]
The 17 original counties of the
Territory of Colorado
County First County Seat
Arapahoe County Denver City
Boulder County Boulder City
Clear Creek County Idaho
Costilla County San Miguel
Douglas County Franktown
El Paso County Colorado City
Fremont County Cañon City
Gilpin County Central City
Guadaloupe County Guadaloupe
Huerfano County Autobees
Jefferson County Golden City
Lake County Oro City
Larimer County La Porte
Park County Tarryall City
Pueblo County Pueblo
Summit County Parkville
Weld County Saint VrainSt. Vrain
6. Of the 17 original Colorado counties created in 1861, only Gilpin County and Clear Creek County have retained their original boundaries with only minor survey changes.
7. Guadalupe County was the first Colorado county to be renamed in 1861.
8. Las Animas County was the first new Colorado county to be created (in 1866) after the original 17 counties.
9. Greenwood County was the longest lived former Colorado county, existing four years from 1870 to 1874.
10. In 1876, San Juan County became the last county created by the Territory of Colorado.
11. In 1877, Ouray County became the first county created by the new State of Colorado.
12. Carbonate County was the shortest lived former Colorado county, existing only two days in 1879 before being dissolved.
13. The City and County of Broomfield became the newest Colorado county in 2001.
14. Las Animas County is the most extensive Colorado county.
15. The City and County of Broomfield is the least extensive Colorado county.
16. El Paso County is the most populous Colorado county.
17. San Juan County is the least populous Colorado county.
18. El Paso County and the City and County of Denver are among the 100 most populous counties of the United States.
19. San Juan County, Mineral County, Hinsdale County, Jackson County, Kiowa County, Cheyenne County, and Dolores County are among the 100 least populous counties of the United States.
20. The City and County of Denver is the most densely populated Colorado county.
21. Hinsdale County is the least densely populated Colorado county.
22. Hinsdale County, Kiowa County, Mineral County, and Jackson County have fewer than one resident per square mile (0.386 km−2).
23. Lake County has the highest point in Colorado at the summit of Mount Elbert at 14,440 feet (4,401 m) elevation (the highest point in the entire Rocky Mountains).
24. Summit County, Pitkin County, and Eagle County each had a 2014 life expectancy of more than 85 years, the three longest-life counties in the United States.[21]
25. Yuma County has the lowest point in Colorado where the Arikaree River flows into Kansas at 3,317 feet (1,011 m) elevation (the highest low point of any U.S. state).
26. Jefferson County borders ten other counties, the most of any Colorado county.[22]
27. Delta County and the City and County of Denver each border only three other counties, the fewest of Colorado counties.[23]
28. The following twelve Colorado counties have a county seat with the same name as the county:
County County Seat
Alamosa County City of Alamosa
Boulder County City of Boulder
BroomfieldCity and County of Broomfield City and County of Broomfield
Conejos County unincorporated town of Conejos
Delta County City of Delta
DenverCity and County of Denver City and County of Denver
Eagle County Town of Eagle
Gunnison County City of Gunnison
Montrose County City of Montrose
Ouray County City of Ouray
Pueblo County City of Pueblo
Saguache County Town of Saguache
29. The name of each of the following two Colorado counties forms one part of the name of its county seat:
County County Seat
Cheyenne County Town of Cheyenne Wells
Morgan County City of Fort Morgan
30. Albeit somewhat confusing, the following towns have the same name as another county:
Town County
Arapahoe Cheyenne County
Dolores Montezuma County
Garfield Chaffee County
Jefferson Park County
Kiowa Elbert County
Kit Carson Cheyenne County
Las Animas Bent County
Moffat Saguache County
Montezuma Summit County
Pitkin Gunnison County
31. Weld County has the most incorporated municipalities of any Colorado county with 31.
32. The following nine Colorado counties have no incorporated municipalities other than their county seat:
County County Seat
Archuleta County Town of Pagosa Springs
Bent County City of Las Animas
BroomfieldCity and County of Broomfield City and County of Broomfield
DenverCity and County of Denver City and County of Denver
Hinsdale County Town of Lake City
Jackson County Town of Walden
Lake County City of Leadville
Mineral County Town of Creede
San Juan County Town of Silverton
33. Of all 64 Colorado counties, only Conejos County has a county seat that is not an incorporated municipality.
34. Only three Colorado county seats extend into other counties:
County County Seat Other Counties
Adams County City of Brighton Weld County
Arapahoe County City of Littleton Douglas County and Jefferson County
Gilpin County Central City Clear Creek County
35. The City and County of Denver and the City and County of Broomfield are the only two Colorado counties with enclaves.
36. Arapahoe County, Boulder County, and Jefferson County are the only three dismembered Colorado counties with exclaves.
36. San Juan County has the highest mean elevation of any U.S. county at 11,240 feet (3,426 m). The 25 highest U.S. counties by mean elevation are:[24]
Highest Counties in the United States
Rank County State Mean Elevation
1 San Juan County  Colorado 11,240 feet (3,426 m)
2 Hinsdale County  Colorado 10,826 feet (3,300 m)
3 Lake County  Colorado 10,790 feet (3,289 m)
4 Mineral County  Colorado 10,411 feet (3,173 m)
5 Summit County  Colorado 10,365 feet (3,159 m)
6 Clear Creek County  Colorado 10,264 feet (3,128 m)
7 Pitkin County  Colorado 9,940 feet (3,030 m)
8 Chaffee County  Colorado 9,915 feet (3,022 m)
9 Park County  Colorado 9,572 feet (2,918 m)
10 Gunnison County  Colorado 9,488 feet (2,892 m)
11 Gilpin County  Colorado 9,236 feet (2,815 m)
12 Grand County  Colorado 9,204 feet (2,805 m)
13 Saguache County  Colorado 9,193 feet (2,802 m)
14 Teller County  Colorado 9,052 feet (2,759 m)
15 Rio Grande County  Colorado 9,011 feet (2,747 m)
16 Custer County  Colorado 8,988 feet (2,740 m)
17 Eagle County  Colorado 8,987 feet (2,739 m)
18 Ouray County  Colorado 8,951 feet (2,728 m)
19 Jackson County  Colorado 8,863 feet (2,701 m)
20 Conejos County  Colorado 8,774 feet (2,674 m)
21 Costilla County  Colorado 8,681 feet (2,646 m)
22 Taos County  New Mexico 8,510 feet (2,594 m)
23 Summit County  Utah 8,388 feet (2,557 m)
24 Dolores County  Colorado 8,280 feet (2,524 m)
25 Archuleta County  Colorado 8,101 feet (2,469 m)

See also

References
  1. City Council of the City and County of Denver v. Board of Commissioners of Adams County, 77 P. 858, 861 (1904).
  2. "EPA County FIPS Code Listing". EPA.gov. Retrieved 2008-02-23.
  3. The ANSI INCITS 31:2009 county code is the five-digit code which uniquely identifies counties and county equivalents in the United States. The three-digit number is unique to each individual county within a state, but to be unique within the entire United States, it must be prefixed by the two-digit ANSI INCITS 31:2009 state code. This means that, for example, while Adams County, Colorado is 001, Belknap County, New Hampshire and Alachua County, Florida are also 001. To uniquely identify Adams County, Colorado, one must use the state code of 08 plus the county code of 001; therefore, the unique nationwide identifier for Adams County, Colorado is 08001. The links in the column INCITS are to the Census Bureau Info page for that county.
  4. National Association of Counties. "NACo - Find a county". Archived from the original on September 27, 2007. Retrieved 2008-04-30.
  5. "Colorado County Seats". State of Colorado, Department of Public Health and Environment. 2007-01-30. Retrieved 2007-01-30.
  6. "Colorado Government History". State of Colorado, Department of Personnel & Administration, Colorado State Archives. 2001-04-18. Retrieved 2008-09-25.
  7. "2010 United States Census website". United States Census Bureau, Population Division. Archived from the original on October 6, 2013. Retrieved April 22, 2011.
  8. The name "Saguache" is pronounced /səˈwætʃ/. This name comes from the Ute language noun "sawup" /səˈwʌp/ meaning "sand dunes". The Spanish language version of this name is usually spelled "Saguache", while the English language version is usually spelled "Sawatch".
  9. Merkl, Dameon (February 26, 2013), "What's in a Colorado name pronunciation?", The Denver Post, retrieved March 7, 2013
  10. "Colorado Counties as of May 1, 2011". State of Colorado, Department of Local Affairs. May 1, 2011. Archived from the original on July 1, 2007. Retrieved May 2, 2011.
  11. "Annual Estimates of the Resident Population for Counties: April 1, 2010 to July 1, 2013". 2013 Population Estimates. United States Census Bureau, Population Division. March 2014. Retrieved April 18, 2014.
  12. "Colorado Government History". State of Colorado, Department of Personnel & Administration, Colorado State Archives. April 18, 2001. Retrieved May 2, 2011.
  13. "Colorado County Seats". State of Colorado, Department of Public Health and Environment. Retrieved May 2, 2011.
  14. "Colorado Department of Transportation Maps". State of Colorado, Department of Transportation. Archived from the original on June 12, 2011. Retrieved May 6, 2011.
  15. See the Table of the highest major summits of Colorado
  16. "Colorado County High Points". peakbagger.com. Retrieved May 2, 2011.
  17. Elevations include an adjustment from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88). For further information, please see this United States National Geodetic Survey note.
  18. "Colorado County Maps". anyplaceamerica.com. Retrieved May 2, 2011.
  19. Only a few of these county low points have been verified.
  20. Provisional Laws and Joint Resolutions of the General Assembly of Jefferson Territory. General Assembly of the Territory of Jefferson. 1859–1860. Retrieved 2011-05-05.
  21. Dwyer-Lindgren, Laura (8 May 2017). "Inequalities in Life Expectancy Among US Counties, 1980 to 2014". JAMA Internal Medicine. 177: 1003–1011. doi:10.1001/jamainternmed.2017.0918. PMC 5543324. PMID 28492829. Retrieved 9 May 2017.
  22. Jefferson County, Colorado, borders Boulder County, the City and County of Broomfield, Adams County, the City and County of Denver, Arapahoe County, Douglas County, Teller County, Park County, Clear Creek County, and Gilpin County, Colorado.
  23. Delta County, Colorado, borders Gunnison County, Montrose County, and Mesa County, Colorado. The City and County of Denver, Colorado, borders Adams County, Arapahoe County, and Jefferson County, Colorado.
  24. "Mean County Elevation Lists". County Highpointers. Retrieved May 2, 2011.
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