California's 10th Congressional District (CA-10)

Last updated Oct 1, 2026 · 6 sources

Mark DeSaulnier, a Democrat, has represented the district since 2023.

The district includes parts of Contra Costa and Alameda counties.

According to the Census Bureau's 2020–2024 American Community Survey 5-year estimates, the district has a population of 760,299, a median household income of $153,525, and a median age of 41.1. Of residents 25 and older, 55.6% hold a bachelor's degree or higher.

Representative

Mark DeSaulnier

U.S. Representative for California's 10th District · Democrat

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2026 redistricting

California uses a new congressional map in 2026: AB 604 (Proposition 50), approved by voters Nov 4, 2025.

The 2026 election for CA-10 uses the new map's CA-10; the map on this page shows the district as currently drawn (119th Congress).

Source · All 2026 redistricting changes

2026 election

DeSaulnier has filed with the FEC to run for this seat in 2026. 5 candidates for the seat have reported receipts to the FEC.

5 candidates have reported raising money for the 2026 CA-10 race to the FEC.

Election Day: Tuesday, November 3, 2026

Candidates for CA-10 in 2026 who reported raising money to the FEC
Candidate	Party	Raised	Cash on hand	Through
Mark DeSaulnier (incumbent)	Democratic	$567,258	$586,497	Jun 30
Katherine Piccinini	Republican	$21,074	$6,836	Jun 30
Angela Griffiths	Republican	$11,811	$3,911	Jun 30
Mitchell David Maisler	Democratic	$10,048	-$514	May 13
Joshua Hamilton	Democratic	$7,486	$1,080	Jun 30