In California, 43% of 18-year-olds are registered to vote, compared to 76% of voters 45+
Teens have the power to close the gap.
Learn MoreCalifornia Voter Registration Gap
This maps shows the most recent county-level voter registration rates in California, one of a set of 31 states we currently track, with more states coming soon. Rates are shown for both 18-year-olds and adults ages 45 and older. Click a county to learn more about voter registration in there.
California
43% of 18-year-olds are registered to vote as of Apr 16, 2026.
Learn more about this information.
High school communities can close the gap in California.
Student-led, non-partisan voter registration drives in school ensure every student has the chance to get ready to vote before they graduate.
California County Registration Rates
This table shows the voter registration rates in each California county or county-equivalent as of Apr 16, 2026. We omit counties with populations below 10,000.
See our methods for more details.
| 18 vs 45+ | |||||
|---|---|---|---|---|---|
| Alameda County | 50% | 77% | 19,716 | 1,649,473 | |
| Amador County | 51% | 79% | 258 | 41,428 | |
| Butte County | 29% | 84% | 3,607 | 207,929 | |
| Calaveras County | 54% | 83% | 321 | 46,248 | |
| Colusa County | 67% | 64% | 200 | 21,984 | |
| Contra Costa County | 52% | 81% | 13,563 | 1,165,012 | |
| Del Norte County | 58% | 78% | 187 | 27,107 | |
| El Dorado County | 54% | 88% | 1,891 | 192,662 | |
| Fresno County | 44% | 72% | 14,292 | 1,016,725 | |
| Glenn County | 38% | 68% | 348 | 28,494 | |
| Humboldt County | 31% | 84% | 2,104 | 134,541 | |
| Imperial County | 46% | 71% | 2,659 | 180,202 | |
| Inyo County | 40% | 72% | 148 | 18,739 | |
| Kern County | 42% | 70% | 13,011 | 915,075 | |
| Kings County | 44% | 58% | 2,020 | 153,298 | |
| Lake County | 40% | 71% | 571 | 68,152 | |
| Lassen County | 39% | 75% | 290 | 30,356 | |
| Los Angeles County | 42% | 73% | 122,173 | 9,808,667 | |
| Madera County | 48% | 68% | 2,397 | 160,940 | |
| Marin County | 57% | 81% | 2,869 | 257,969 | |
| Mariposa County | > 90% | 82% | 65 | 17,082 | |
| Mendocino County | 40% | 76% | 935 | 90,244 | |
| Merced County | 32% | 65% | 5,601 | 290,201 | |
| Mono County | 67% | 75% | 68 | 13,148 | |
| Monterey County | 41% | 68% | 6,781 | 437,613 | |
| Napa County | 43% | 80% | 1,645 | 134,869 | |
| Nevada County | 59% | 87% | 832 | 102,481 | |
| Orange County | 42% | 76% | 41,733 | 3,165,820 | |
| Placer County | 56% | > 90% | 4,508 | 419,156 | |
| Plumas County | 64% | 79% | 122 | 19,423 | |
| Riverside County | 46% | 75% | 34,472 | 2,478,600 | |
| Sacramento County | 50% | 78% | 18,591 | 1,594,006 | |
| San Benito County | 47% | 81% | 925 | 67,290 | |
| San Bernardino County | 47% | 75% | 30,021 | 2,197,104 | |
| San Diego County | 39% | 82% | 45,520 | 3,288,774 | |
| San Francisco County | 40% | 75% | 6,989 | 830,235 | |
| San Joaquin County | 43% | 71% | 10,905 | 797,334 | |
| San Luis Obispo County | 25% | 87% | 6,945 | 281,555 | |
| San Mateo County | 47% | 78% | 7,525 | 742,340 | |
| Santa Barbara County | 32% | 78% | 10,188 | 443,701 | |
| Santa Clara County | 43% | 77% | 23,641 | 1,902,047 | |
| Santa Cruz County | 27% | 84% | 6,370 | 264,926 | |
| Shasta County | 48% | 83% | 1,932 | 181,436 | |
| Siskiyou County | 36% | 81% | 455 | 43,466 | |
| Solano County | 48% | 80% | 4,986 | 451,918 | |
| Sonoma County | 49% | 82% | 5,726 | 485,040 | |
| Stanislaus County | 44% | 74% | 7,695 | 553,990 | |
| Sutter County | 53% | 75% | 1,273 | 98,857 | |
| Tehama County | 41% | 75% | 782 | 65,167 | |
| Trinity County | 20% | 55% | 137 | 15,860 | |
| Tulare County | 45% | 65% | 7,254 | 478,693 | |
| Tuolumne County | 42% | 83% | 504 | 54,498 | |
| Ventura County | 53% | 80% | 10,597 | 837,469 | |
| Yolo County | 20% | 83% | 7,135 | 220,564 | |
| Yuba County | 46% | 80% | 1,135 | 84,507 |
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About this information
The voter data shown on this page comes from a commercial source that compiles official state records and was last updated on Jun 9, 2026. Population estimates come from the American Community Survey. To learn more, read our research model.
These pages are offered for guidance only and are not intended as legal advice. Please consult state election officials or an attorney if you have questions about any particular situation. We hope you find this useful. To cite our resources and original research, please provide links and/or cite The Civics Center.
If you have a question or noticed a discrepancy, please contact us.
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