Missouri's 3rd Congressional District is represented by Robert Onder (Republican), who has held the seat since 2025. Onder has an overall VoteSee report card grade of D, voted in 97% of roll-call votes on bills this Congress, and votes with the Republican majority 92% of the time. The district includes Columbia, St. Charles, and St. Peters. It takes in all or part of 16 counties; the most populous parts are in St. Charles County and Boone County. About 780,000 people live in the district, and the median household income is $81,928.
Current Representative
Robert Onder (Republican) has represented Missouri's 3rd Congressional District since 2025.
VoteSee report card grade: D
Attendance in the 119th Congress: 97% of roll-call votes on bills
Incumbent Bob Onder is running for re-election. 3 candidates were on the Nov 3, 2026 ballot.
Bob Onder (Republican), incumbent: raised $1.1M, $526K cash on hand; VoteSee report card D; 97% attendance; votes with the Republican majority 92% of the time
Bethany Mann (Democratic): raised $87K, $6K cash on hand
Members of Congress who previously represented Missouri's 3rd Congressional District. District lines are redrawn after each census, so earlier members may have represented a different area under this number.