Illinois' 12th Congressional District
Illinois · IL-12
Illinois' 12th Congressional District is one of 17 U.S. House districts in Illinois, represented in Congress by Mike Bost (Republican). It is home to roughly 748,234 people, with a median age of 41.6. The population is about 88% White. The median household income is $66,858, and 24% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted safely Republican (R+43).
Representative
Current U.S. House member (source: house.gov).
Geography
IL-12 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
Covering 14,264 square miles, IL-12 is the 54th-largest of the 435 congressional districts by land area. With about 52 residents per square mile, it is a predominantly rural district. Its shape is irregular: the district's Polsby-Popper score of 0.27 ranks 223rd of 435 nationally, where 1st is the most compact.
Presidential results
In the 2024 presidential election, 28% of IL-12 voters backed Kamala Harris and 71% Donald Trump — a R+43 margin. The district's presidential lean was essentially unchanged from 2020 (R+43).
Two-party presidential vote by district (source: The Downballot).
Who lives here
The median resident of the district is 41.6 years old; 21.8% of residents are under 18 and 19.5% are 65 or older. About 2% of residents were born outside the United States, and 3.7% speak a language other than English at home.
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
At $66,858, the district's median household income ranks 330th of 435 districts nationwide. The typical owner-occupied home is worth $140,586, and the median rent is $806 a month. 13% of residents live below the poverty line, and workers average a 24.8-minute commute (7.8% work from home).
U.S. Census Bureau, American Community Survey (5-year estimates).