List of members of the United States Congress from multiple states

Only two Senators have represented more than one state.[1]

• James Shields uniquely served terms in the US Senate for three states; representing Illinois (1849–55), Minnesota (1858–59), and 20 years later he was appointed by the State of Missouri for a term expiring in just six weeks (1879). He was also a Union General in the American Civil War. He was a Democrat.[2]
• Waitman Thomas Willey was a Restored Government of Virginia Senator (1861–1863) who helped create West Virginia. He was then appointed as one of the new state's first two Senators (1863–1871). He was a Unionist until 1865 and a Republican thereafter.[1]

• James M. Cavanaugh – represented Minnesota (1858–59) as a Representative and then Montana Territory (1867–71) as a Delegate. He was a Democrat.
• Stephen Benton Elkins – represented New Mexico Territory (1873–77) as a Delegate and later West Virginia (1895–1911) as a Senator. He was a Republican.
• John Noble Goodwin – represented Maine as a Representative (1861–63) and later Arizona Territory as a Delegate (1866–76). He was also first Governor of the Territory of Arizona. He was a Republican.
• George Wallace Jones – was a Delegate from Michigan Territory (1835–37) until Michigan was created as a State. He continued representing the remaining renamed Wisconsin Territory as a Delegate (1837–39). Later, after Iowa was carved from the Wisconsin Territory and subsequently admitted to the Union, he became one of the first Senators from Iowa (1848–59). He was a Democrat.
• Richard Cunningham McCormick – represented Arizona Territory (1869–75) and later New York as a representative (1895–97). He was a Unionist as a delegate and a Republican as a representative.
• Henry Hastings Sibley – represented Wisconsin Territory (1848–49) and later Minnesota Territory as a Delegate (1849–53) as a Delegate. He was a Democrat.
• Jesse B. Thomas – represented Indiana Territory (1808–09) as a Delegate and later Illinois (1818–1829) as a Senator. He was initially a Democratic-Republican, but became an Anti-Jacksonian while Senator.
• William H. Wallace – represented Washington Territory (1861–63) and later Idaho Territory as a Delegate (1864–65) as a Delegate. He was a Republican.