California Citizen Voting-age Population By County in 2017 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2017, the citizen voting-age population for California was 24,970,110 and represented 64.05% of the total California population.

Among all California counties, Los Angeles had the highest citizen voting-age population (6.22M), followed by San Diego (2.21M), and Orange (2.02M).

In terms of percentages, Sierra had the highest percentage of its population being citizens of voting-age (83.88%), followed by Amador (82.23%), and Plumas (81.84%).

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

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

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California Citizen Voting-age Population By County in 2017
California Citizen Voting-age Population By County in 2017
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County Citizen Voting-age Population % of County Population
Los Angeles 6218280 61.53
San Diego 2207600 67.23
Orange 2021030 64.04
Riverside 1487320 63.16
San Bernardino 1332785 62.83
Santa Clara 1162020 60.80
Alameda 1056115 64.81
Sacramento 1013095 67.75
Contra Costa 743845 66.20
San Francisco 641255 74.20
Fresno 575985 59.28
Ventura 551510 65.05
Kern 512065 58.27
San Mateo 494910 64.83
San Joaquin 442155 61.06
Sonoma 354995 70.86
Stanislaus 331295 61.85
Solano 302380 69.52
Santa Barbara 281010 63.43
Placer 275790 73.55
Tulare 249665 54.42
Monterey 231735 53.50
San Luis Obispo 214960 76.74
Santa Cruz 189870 69.48
Marin 184740 70.83
Butte 172105 76.42
Merced 148455 55.52
Yolo 142945 67.24
El Dorado 139365 75.33
Shasta 135635 75.81
Humboldt 105235 77.67
Imperial 100555 55.88
Napa 95210 67.52
Kings 92010 61.26
Madera 90030 58.29
Nevada 78585 79.51
Mendocino 61820 70.66
Sutter 60185 62.97
Yuba 49480 66.29
Lake 48145 75.11
Tehama 45460 71.88
Tuolumne 43975 81.59
San Benito 36370 61.99
Calaveras 35785 79.43
Siskiyou 33670 77.35
Amador 30675 82.23
Lassen 25120 79.82
Del Norte 20805 75.82
Glenn 16755 59.98
Plumas 15325 81.84
Mariposa 14130 80.01
Inyo 13620 74.86
Colusa 12365 57.57
Trinity 10465 80.28
Mono 9285 66.04
Modoc 6785 75.26
Sierra 2420 83.88
Alpine 935 77.59