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Illinois's 12th district

U.S. House district profile: the sitting representative, 2024 Census demographics (119th-district boundaries), partisan lean, and 2026 race rating.

Representative

Official portrait of Mike Bost

Mike Bost

IL · District 12
RepublicanChair, House Committee on Veterans' Affairs
Raised $1,327,225 · 71K followers (office + personal) · missed 1.6% of votes
11.7 years in Congress · Up for reelection: 2026
House Committee on Transportation and Infrastructure · House Committee on Agriculture +5 more
View profile

Cook PVI: R+22

District demographics

MeasureValue
Population745,901
Median household income$70,903
Median age42.0
Bachelor's degree or higher24.4%
White alone86.4%
Black alone5.3%
Hispanic or Latino2.9%
Asian alone1.0%
Unemployment rate4.2%
Population density (per sq mi)53

Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates (tables B01003, B01002, B19013 and related), 119th Congress district boundaries, released September 2025; land area from the 2025 Gazetteer.