California Voting-age Population By County in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the voting-age population of California was 30.46M which was 77.21% of the total California population. Among all California counties, Los Angeles had the highest voting-age population (7.85M), followed by San Diego (2.58M), and Orange (2.48M).

On the other hand, the counties with the least voting-age population were: Alpine (1.06K), Sierra (2.60K), and Modoc (7.01K).

The chart and table below shows the voting-age population of each county and the percentage of each county's population that are of voting-age.

You can see similar information for other states and by state for the United States.

Related Topics: California ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates, 2021 Census.

California Voting-age Population By County in 2021

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County	Voting-age Population	% of County Population
Alameda	1329045	79.44
Alpine	1055	78.50
Amador	33981	84.75
Butte	173574	79.66
Calaveras	37627	82.97
Colusa	15844	72.75
Contra Costa	898135	77.32
Del Norte	21665	78.34
El Dorado	152500	80.02
Fresno	716839	71.46
Glenn	20906	72.91
Humboldt	110770	80.85
Imperial	128186	71.19
Inyo	14808	78.75
Kern	642656	70.96
Kings	110539	72.78
Lake	53260	78.61
Lassen	27533	83.56
Los Angeles	7850552	78.35
Madera	113116	72.37
Marin	209933	80.01
Mariposa	14329	83.19
Mendocino	71947	78.60
Merced	196572	70.42
Modoc	7014	80.41
Mono	10644	80.08
Monterey	323519	73.70
Napa	110391	79.54
Nevada	84513	82.78
Orange	2483232	78.02
Placer	310884	77.66
Plumas	16210	82.57
Riverside	1802796	74.83
Sacramento	1199220	76.30
San Benito	46877	74.02
San Bernardino	1597087	73.56
San Diego	2582479	78.34
San Francisco	747739	86.35
San Joaquin	561891	72.84
San Luis Obispo	232556	82.24
San Mateo	606703	79.57
Santa Barbara	347143	77.55
Santa Clara	1509959	78.15
Santa Cruz	220153	80.90
Shasta	142312	78.22
Sierra	2604	84.57
Siskiyou	35170	79.66
Solano	350936	77.74
Sonoma	395702	80.35
Stanislaus	400551	72.72
Sutter	73301	73.98
Tehama	49606	75.91
Trinity	13245	83.73
Tulare	325892	69.19
Tuolumne	45855	83.01
Ventura	652005	77.14
Yolo	171254	79.03
Yuba	58106	72.27