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Contra Costa County, California
What we have for Contra Costa County today, and what is coming.
Basics
- County code (FIPS): 06013
- Land area: 717 square miles
- Population: 1,165,927
Federal money spent here
Fiscal year 2026: $7.7 billion in federal contracts, grants, loans and other awards for work done in Contra Costa County.
Who represents Contra Costa County
U.S. Senate (whole state): Alex Padilla (Democrat), Adam B. Schiff (Democrat).
U.S. House districts that include part of this county
| District | Member | Share of county land |
|---|---|---|
| Congressional District 10 | Mark DeSaulnier (Democrat) | 73.4% |
| Congressional District 8 | John Garamendi (Democrat) | 21.6% |
| Congressional District 9 | Josh Harder (Democrat) | 5% |
State senate districts
| District | Member | Share of county land |
|---|---|---|
| State Senate District 9 | Tim Grayson (Democratic) | 73.8% |
| State Senate District 3 | Christopher Cabaldon (Democratic) | 17.3% |
| State Senate District 7 | Jesse Arreguín (Democratic) | 8.9% |
State house / assembly districts
| District | Member | Share of county land |
|---|---|---|
| Assembly District 15 | Anamarie Avila Farias (Democratic) | 45.1% |
| Assembly District 16 | Rebecca Bauer-Kahan (Democratic) | 32.5% |
| Assembly District 11 | Lori Wilson (Democratic) | 12.6% |
| Assembly District 14 | Buffy Wicks (Democratic) | 9.8% |
Matched by district number using the U.S. Census Bureau 2020 county–district relationship files (land area overlap; districts may have been redrawn since). Your exact district depends on your address: U.S. House · state legislators.
County government
Find the official county website and contacts in the USA.gov local government directory or the National Association of Counties explorer.
Sources: U.S. Census Bureau Gazetteer (county list, public domain); USAspending.gov (U.S. Treasury). Built 2026-11-03 15:28.