O'Fallon, IL politics & representatives
O'Fallon is represented in Congress by Senators Richard J. Durbin and Tammy Duckworth and Representatives Mike Bost and Nikki Budzinski. J. B. Pritzker is governor.
Who represents O'Fallon in Washington and in Illinois, with how to reach each office.
How St. Clair County voted in 2024
Official results for all of St. Clair County. O'Fallon's own results aren't published in a form we can match to the town exactly, so these are the county's.
President 120,879 votes
Illinois: Harris 54.4%, Trump 43.5%
U.S. House · Illinois's 12th District 367,629 votes
Covers about 71% of O'Fallon · whole-district result
U.S. House · Illinois's 13th District 330,119 votes
Covers about 29% of O'Fallon · whole-district result
Source: MIT Election Data + Science Lab, official 2024 precinct returns (statewide totals from its official state files). Percentages are of votes for candidates; blank and spoiled ballots aren't counted.
Who represents O'Fallon in Congress
U.S. Senate Both senators represent all of Illinois
U.S. House · Illinois's 12th District Covers about 71% of O'Fallon
U.S. House · Illinois's 13th District Covers about 29% of O'Fallon
O'Fallon is split between 2 congressional districts. Find yours by ZIP code ↗
Who represents O'Fallon in state government
State Senate · District 57 Covers about 63% of O'Fallon
State Senate · District 56 Covers about 25% of O'Fallon
State Senate · District 55 Covers about 12% of O'Fallon
State House O'Fallon is split between 4 districts
- District 11447% of O'FallonKevin Schmidt Republican
- District 11225% of O'FallonKatie Stuart Democrat
- District 11316% of O'FallonJay Hoffman Democrat
- District 10912% of O'FallonCharlie Meier Republican
O'Fallon is split between state legislative districts. Find yours by address ↗
O'Fallon's own government: Town Hall →
Sources: congressional and state legislative districts from the U.S. Census Bureau (119th Congress, 2024 state districts); members of Congress from the congress-legislators project (portraits public domain); governors and state legislators from Open States. Districts are matched to O'Fallon by land area, so if the town is split, your street decides which one is yours.