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[Creeperopolis]

The U.S. state of Illinois held an election on November 3, 1964, for all 177 members of the state's House of Representatives for the 74th Illinois General Assembly, alongside other state and federal elections. Due to the state's failure to redistrict, all of the seats were elected at-large, with voters choosing up to 177 candidates to support. Each party was only allowed to nominate 118 candidates. All 118 Democratic candidates won, flipping control of the chamber to Democrats with a two-thirds supermajority.

From 1901 to 1954, the state had failed to conduct legislative redistricting, at which point a constitutional amendment to force regular redistricting of the House was passed. Under its provisions, if the legislature and a backup redistricting commission failed to enact a map, an election would be held at-large. For the 1960 redistricting cycle, the state's governor was Democrat Otto Kerner Jr., while both chambers of the legislature were controlled by Republicans. The legislature passed a map along partisan lines which was vetoed by Kerner, and the commission faced similar partisan deadlock. Following a ruling by the Supreme Court of Illinois, an at-large election was held.

The ballot for the election was 33 inches (84 cm) long. Both parties nominated their candidates at party conventions, which were made up of delegates elected on the old legislative lines. Candidates did little campaigning outside of their home regions. Due to straight-ticket voting and the coattails of Lyndon B. Johnson in the concurrent presidential election, every Democrat was elected, receiving more votes than every Republican. The Republicans elected were mainly those endorsed by Chicago-area newspapers.

Reactions to the election were mixed. Politicians in both political parties received significant criticism for their failure to redistrict. Some pundits predicted significant voter confusion, and a high number of undervotes, but this did not happen. The legislature elected in 1964 pushed for governmental reform, starting the process that eventually led to the 1970 rewrite of the Constitution of Illinois. This election is the only time a state legislature has been elected at-large in the United States.