1958 Illinois elections

In the primary election, 1,594,388 ballots were cast (831,502 Democratic and 762,886 Republican).[1]

In the general election, turnout was 67.72% with 3,427,278 ballots cast.[1][2]

All 25 Illinois seats in the United States House of Representatives were up for election in 1958.

Democrats flipped three Republican-held seats, leaving the Illinois House delegation to consist of 14 Democrats and 11 Republicans.

1958 Illinois State Treasurer election

November 4, 1958
Turnout	63.98%[1][2]
Nominee Joseph D. Lohman Warren Wright Party Democratic Republican Popular vote 1,688,809 1,548,902 Percentage 52.16% 47.84%
Treasurer before election Francis S. Lorenz Democratic Elected Treasurer Joseph D. Lohman Democratic

Incumbent Treasurer, Republican Elmer J. Hoffman, did not seek reelection, instead running successfully for Illinois's 14th congressional district. Democrat Joseph D. Lohman was elected to succeed him, defeating former two-term Illinois Treasurer, Republican Warren Wright.

Former treasurer Warren Wright won the Republican primary, defeating State Representative Louis E. Beckman Jr.

1958 Illinois Superintendent of Public Instruction election

November 4, 1958
Turnout	70.87%[1][2]
Nominee George T. Wilkins Gerald W. Smith Party Democratic Republican Popular vote 1,685,877 1,477,332 Percentage 53.30% 46.70%
Superintendent before election Vernon L. Nickell Republican Elected Superintendent George T. Wilkins Democratic

Incumbent Superintendent of Public Instruction Vernon L. Nickell, a fourth-term Republican, did not seek reelection. Democrat George T. Wilkins was elected to succeed him.

Seats in the Illinois Senate were up for election in 1958. Republicans retained control of the chamber.

Seats in the Illinois House of Representatives were up for election in 1958. Democrats flipped control of the chamber.

An election was held for three of nine seats for Trustees of University of Illinois.

The election saw the reelection of one-term member former member Harold Pogue and the election of new Democratic members Howard W. Clement, Richard A. Harewood.[1][3]

The election saw third-term incumbent Republican Park Livingston, second term Republican incumbent Doris Simpson Holt and first-term incumbent Republican Cushman B. Bissell lose reelection.[1][3]

On June 8, 1958 the Superior Court of Cook County held three regular elections and two special elections.[1] On September 2, 1958, a special election was held for a vacant seat on the 12th Judicial Circuit.[1]

Two ballot measures were put before voters in 1958. One was a legislatively referred state statute and one was a legislatively referred constitutional amendment.[1]

In order to be approved, legislatively referred state statues required the support of a majority of those voting on the statute.[1] In order to be placed on the ballot, proposed legislatively referred constitutional amendments needed to be approved by two-thirds of each house of the Illinois General Assembly.[4] In order to be approved, they required approval of either two-thirds of those voting on the amendment itself or a majority of all ballots cast in the general elections.[1]

Amendments to Illinois Banking was approved by voters as a legislatively referred state statute. It made modified the state's banking law.

The Judicial Article Amendment, a legislatively referred constitutional amendment which amended Article VI of the 1870 Constitution of Illinois, failed to meet either threshold for approval.[1]

In order for constitutional amendments to be passed by voters, they required either two-thirds support among those specifically voting on the measure or 50% support among all ballots cast in the elections.[5][6]