Fastest growing counties in California.
County | Rank | Change (2020) | 2024 Pop. | 2020 Pop. |
|---|---|---|---|---|
| San Benito County | 1 | 6.47% | 68,707 | 64,530 |
| Yuba County | 2 | 6.26% | 87,091 | 81,958 |
| Madera County | 3 | 5.78% | 165,387 | 156,345 |
| Placer County | 4 | 5.7% | 429,048 | 405,927 |
| Merced County | 5 | 4.19% | 293,630 | 281,830 |
| Amador County | 6 | 3.96% | 42,129 | 40,525 |
| Riverside County | 7 | 3.62% | 2,510,643 | 2,422,993 |
| San Joaquin County | 8 | 3.46% | 807,637 | 780,617 |
| Calaveras County | 9 | 2.7% | 46,574 | 45,348 |
| Tulare County | 10 | 1.51% | 481,052 | 473,914 |
| Colusa County | 11 | 1.38% | 22,165 | 21,864 |
| Yolo County | 12 | 1.28% | 219,070 | 216,291 |
| Fresno County | 13 | 0.93% | 1,018,965 | 1,009,552 |
| San Bernardino County | 14 | 0.59% | 2,196,314 | 2,183,391 |
| Kern County | 15 | 0.55% | 910,889 | 905,910 |
| El Dorado County | 16 | 0.21% | 191,643 | 191,245 |
| Sacramento County | 17 | -0.15% | 1,584,196 | 1,586,566 |
| San Luis Obispo County | 18 | -0.23% | 281,232 | 281,884 |
| Imperial County | 19 | -0.24% | 179,174 | 179,612 |
| Stanislaus County | 20 | -0.29% | 551,634 | 553,257 |
| Kings County | 21 | -0.31% | 152,377 | 152,844 |
| Nevada County | 22 | -0.58% | 101,673 | 102,265 |
| Solano County | 23 | -0.7% | 449,551 | 452,723 |
| Mono County | 24 | -0.74% | 13,130 | 13,228 |
| Lake County | 25 | -0.9% | 67,584 | 68,199 |
| San Diego County | 26 | -0.99% | 3,262,770 | 3,295,298 |
| Contra Costa County | 27 | -1.12% | 1,153,031 | 1,166,069 |
| Shasta County | 28 | -1.21% | 179,795 | 182,002 |
| Sierra County | 29 | -1.46% | 3,178 | 3,225 |
| Sonoma County | 30 | -1.5% | 480,955 | 488,282 |
| Butte County | 31 | -1.51% | 206,975 | 210,151 |
| Tehama County | 32 | -1.82% | 64,493 | 65,687 |
| Mariposa County | 33 | -1.95% | 16,785 | 17,119 |
| Ventura County | 34 | -2.02% | 826,309 | 843,371 |
| Orange County | 35 | -2.03% | 3,121,138 | 3,185,734 |
| Sutter County | 36 | -2.16% | 97,327 | 99,479 |
| Santa Barbara County | 37 | -2.19% | 438,599 | 448,424 |
| Monterey County | 38 | -2.23% | 428,562 | 438,322 |
| Humboldt County | 39 | -2.37% | 133,026 | 136,262 |
| Santa Clara County | 40 | -2.81% | 1,876,849 | 1,931,168 |
| Tuolumne County | 41 | -2.81% | 53,821 | 55,379 |
| Trinity County | 42 | -3.29% | 15,562 | 16,091 |
| Marin County | 43 | -3.31% | 252,660 | 261,306 |
| Modoc County | 44 | -3.46% | 8,381 | 8,681 |
| Mendocino County | 45 | -3.46% | 88,209 | 91,367 |
| Glenn County | 46 | -3.48% | 27,898 | 28,904 |
| Inyo County | 47 | -3.56% | 18,312 | 18,987 |
| Alameda County | 48 | -3.83% | 1,616,117 | 1,680,466 |
| Los Angeles County | 49 | -3.86% | 9,606,925 | 9,992,813 |
| Napa County | 50 | -3.93% | 132,062 | 137,459 |
| Santa Cruz County | 51 | -4.3% | 258,854 | 270,474 |
| Siskiyou County | 52 | -4.48% | 42,024 | 43,995 |
| Plumas County | 53 | -4.69% | 18,819 | 19,746 |
| San Mateo County | 54 | -5.08% | 723,777 | 762,479 |
| Del Norte County | 55 | -5.57% | 26,066 | 27,604 |
| San Francisco County | 56 | -6.93% | 810,202 | 870,518 |
| Alpine County | 57 | -9.38% | 1,092 | 1,205 |
| Lassen County | 58 | -14.28% | 27,702 | 32,315 |