Illinois's 15th Congressional District is represented by Mary Miller (Republican), who has held the seat since 2021. Miller has an overall VoteSee report card grade of D, voted in 96% of roll-call votes on bills this Congress, and votes with the Republican majority 85% of the time. The district includes Quincy, Decatur, and Springfield. It takes in all or part of 35 counties; the most populous parts are in Madison County and Adams County. About 747,000 people live in the district, and the median household income is $73,993.
Current Representative
Mary Miller (Republican) has represented Illinois's 15th Congressional District since 2021.
VoteSee report card grade: D
Attendance in the 119th Congress: 96% of roll-call votes on bills
Incumbent Mary Miller is running for re-election. 2 candidates were on the Nov 3, 2026 ballot.
Mary Miller (Republican), incumbent: raised $1.9M, $911K cash on hand; VoteSee report card D; 96% attendance; votes with the Republican majority 85% of the time
Jennifer Todd (Democratic): raised $210K, $37K cash on hand
Members of Congress who previously represented Illinois's 15th Congressional District. District lines are redrawn after each census, so earlier members may have represented a different area under this number.