San Mateo County, California Citizen Voting-age Population By Race and Ethnicity in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen voting-age population for San Mateo County, CA was 498.14K. The Non-Hispanic White Alone ethnicity group had the highest citizen voting-age population (238.55K) and constituted 47.89% of the total.

The Non-Hispanic Asian Alone ethnicity group had the second highest citizen voting-age population (136.30K) and constituted 27.36% of the total. The Hispanic or Latino of All Races ethnicity group had the third highest (88.22K), constituting 17.71% of the total citizen voting-age population.

The charts and tables below shows the citizen voting-age population and percentages by race and ethnicity.

You can also see similar information for other California counties, and for California.

Data Source: US Census - ACS 5-Years (CVAP).

See this for other years:

San Mateo County, California Citizen Voting-age Population By Race and Ethnicity in 2018

Non-Hispanic White Alone

Non-Hispanic Asian Alone

Hispanic or Latino of All Races

Non-Hispanic Black Alone

Non-Hispanic Two Or More Races

Non-Hispanic Native Hawaiian & Pac. Islander Alone

Non-Hispanic American Indian & Alaska Native Alone

San Mateo County, California Citizen Voting-age Population By Race and Ethnicity in 2018

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Ethnicity	Voting-age Population	% of Voting-age Pop.
Non-Hispanic White Alone	238545	47.89
Non-Hispanic Asian Alone	136300	27.36
Hispanic or Latino of All Races	88220	17.71
Non-Hispanic Black or African American Alone	13875	2.79
Non-Hispanic Two Or More Races	13725	2.76
Non-Hispanic Native Hawaiian And Pacific Islander Alone	6570	1.32
Non-Hispanic American Indian and Alaska Native Alone	915	0.18