electionsmcp

electionsmcp › California counties › Contra Costa

Contra Costa County, CA

The certified 2024 map, county by county — Contra Costa in amber. Open it and every precinct inside is yours to model.

Model Contra Costa County, precinct by precinct →

California by certified 2024 presidential result · Contra Costa County in amber · open the live map →

2024 president

Democratic D+37.9

Votes cast

528,904

State

California

Grain

Precinct-level

Frequently asked

How did Contra Costa County vote in 2024?
D+37.9 for president — 356,008 Democratic · 155,308 Republican of 528,904 votes.
Can I model Contra Costa County precinct by precinct?
Yes — open the county in the simulator and every precinct inside it is editable, with real 2024 returns as the baseline. The county rolls up live into its statewide races.
What races cover Contra Costa County?
Every statewide race (U.S. Senate, Governor, the executive offices) plus its U.S. House and state-legislature districts — all modelable from the same county baseline.

Every county in California

AlamedaAlpineAmadorButteCalaverasColusaDel NorteEl DoradoFresnoGlennHumboldtImperialInyoKernKingsLakeLassenLos AngelesMaderaMarinMariposaMendocinoMercedModocMonoMontereyNapaNevadaOrangePlacerPlumasRiversideSacramentoSan BenitoSan BernardinoSan DiegoSan FranciscoSan JoaquinSan Luis ObispoSan MateoSanta BarbaraSanta ClaraSanta CruzShastaSierraSiskiyouSolanoSonomaStanislausSutterTehamaTrinityTulareTuolumneVenturaYoloYuba

The races above this county

California U.S. Senate · Governor · the 2026 Senate board · the 2026 House board