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electionsmcp › California counties › San Mateo

San Mateo County, CA

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

Model San Mateo County, precinct by precinct →

California by certified 2024 presidential result · San Mateo County in amber · open the live map →

2024 president

Democratic D+50.3

Votes cast

330,510

State

California

Grain

Precinct-level

Frequently asked

How did San Mateo County vote in 2024?
D+50.3 for president — 242,957 Democratic · 76,616 Republican of 330,510 votes.
Can I model San Mateo 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 San Mateo 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

AlamedaAlpineAmadorButteCalaverasColusaContra CostaDel NorteEl DoradoFresnoGlennHumboldtImperialInyoKernKingsLakeLassenLos AngelesMaderaMarinMariposaMendocinoMercedModocMonoMontereyNapaNevadaOrangePlacerPlumasRiversideSacramentoSan BenitoSan BernardinoSan DiegoSan FranciscoSan JoaquinSan Luis ObispoSanta BarbaraSanta ClaraSanta CruzShastaSierraSiskiyouSolanoSonomaStanislausSutterTehamaTrinityTulareTuolumneVenturaYoloYuba

The races above this county

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