California's 10th Congressional District is represented by Mark DeSaulnier (Democrat), who has served in the House since 2015 and has represented this district since redistricting in 2023. DeSaulnier has an overall VoteSee report card grade of C, voted in 98% of roll-call votes on bills this Congress, and votes with the Democratic majority 97% of the time. The district includes Concord, San Ramon, and Walnut Creek. It takes in all or part of 2 counties, and 93% of residents live in Contra Costa County. About 760,000 people live in the district, and the median household income is $153,525.
Mark DeSaulnier (Democrat) has served in the House since 2015 and has represented California's 10th Congressional District since redistricting in 2023.
See Mark DeSaulnier's full voting record and issue positions →
Winner: Mark DeSaulnier.
Incumbent Mark DeSaulnier is running for re-election. 2 candidates were on the Nov 3, 2026 ballot.
California uses a top-two primary, so the two November candidates can be from the same party.
Polls: No public polls
Source: American Community Survey 2020–2024 5-year estimates, 119th Congress boundaries.
Members of Congress who previously represented California's 10th Congressional District. District lines are redrawn after each census, so earlier members may have represented a different area under this number.
California's 10th Congressional District covers 537 square miles of land. Boundaries are for the current (119th) Congress.