California county populations
58 supported county-equivalent records in California; July 1, 2025 population, 2024–2025 growth and 2025 land-area density.
Population totals use July 1, 2025 observations from PEP Vintage 2025. Change is measured since July 1, 2024. County equivalents are included, including Connecticut planning regions. Missing density is displayed as unavailable, never as zero.
Population table and filters
Whole-dataset downloads| Place | Population · 2025 | Change · 2024–25 | Growth · 2024–25 | People / sq. mi. |
|---|---|---|---|---|
| Los Angeles CountyCalifornia · County equivalent · 06037 | 9,694,934 | -53,934 | -0.55% | 2,387.7 |
| San Diego CountyCalifornia · County equivalent · 06073 | 3,282,248 | -5,294 | -0.16% | 779.5 |
| Orange CountyCalifornia · County equivalent · 06059 | 3,149,507 | -8,520 | -0.27% | 3,970.4 |
| Riverside CountyCalifornia · County equivalent · 06065 | 2,544,916 | +15,804 | +0.62% | 353.0 |
| San Bernardino CountyCalifornia · County equivalent · 06071 | 2,224,091 | +5,327 | +0.24% | 110.8 |
| Santa Clara CountyCalifornia · County equivalent · 06085 | 1,914,391 | +6,481 | +0.34% | 1,482.8 |
| Alameda CountyCalifornia · County equivalent · 06001 | 1,636,630 | +6 | +0.00% | 2,219.3 |
| Sacramento CountyCalifornia · County equivalent · 06067 | 1,618,460 | +8,563 | +0.53% | 1,676.5 |
| Contra Costa CountyCalifornia · County equivalent · 06013 | 1,170,070 | +536 | +0.05% | 1,632.1 |
| Fresno CountyCalifornia · County equivalent · 06019 | 1,035,456 | +1,758 | +0.17% | 173.8 |
| Kern CountyCalifornia · County equivalent · 06029 | 927,068 | +2,420 | +0.26% | 114.0 |
| Ventura CountyCalifornia · County equivalent · 06111 | 830,851 | -2,580 | -0.31% | 451.4 |
| San Francisco CountyCalifornia · County equivalent · 06075 | 826,079 | +5,134 | +0.63% | 17,694.7 |
| San Joaquin CountyCalifornia · County equivalent · 06077 | 823,815 | +6,666 | +0.82% | 591.7 |
| San Mateo CountyCalifornia · County equivalent · 06081 | 743,568 | +2,941 | +0.40% | 1,657.5 |
| Stanislaus CountyCalifornia · County equivalent · 06099 | 557,719 | +347 | +0.06% | 372.8 |
| Sonoma CountyCalifornia · County equivalent · 06097 | 486,444 | +1,081 | +0.22% | 308.8 |
| Tulare CountyCalifornia · County equivalent · 06107 | 485,146 | +1,295 | +0.27% | 100.6 |
| Solano CountyCalifornia · County equivalent · 06095 | 455,376 | +300 | +0.07% | 554.2 |
| Placer CountyCalifornia · County equivalent · 06061 | 442,081 | +7,802 | +1.80% | 314.1 |
| Santa Barbara CountyCalifornia · County equivalent · 06083 | 442,065 | -1,016 | -0.23% | 161.7 |
| Monterey CountyCalifornia · County equivalent · 06053 | 433,729 | +282 | +0.07% | 132.2 |
| Merced CountyCalifornia · County equivalent · 06047 | 297,260 | +453 | +0.15% | 153.4 |
| San Luis Obispo CountyCalifornia · County equivalent · 06079 | 282,367 | +214 | +0.08% | 85.5 |
| Santa Cruz CountyCalifornia · County equivalent · 06087 | 258,852 | -2,565 | -0.98% | 581.6 |
| Marin CountyCalifornia · County equivalent · 06041 | 253,694 | -2,010 | -0.79% | 487.7 |
| Yolo CountyCalifornia · County equivalent · 06113 | 224,410 | +1,150 | +0.52% | 221.5 |
| Butte CountyCalifornia · County equivalent · 06007 | 209,211 | +625 | +0.30% | 127.8 |
| El Dorado CountyCalifornia · County equivalent · 06017 | 192,323 | -48 | -0.02% | 112.6 |
| Shasta CountyCalifornia · County equivalent · 06089 | 181,648 | +256 | +0.14% | 48.1 |
| Imperial CountyCalifornia · County equivalent · 06025 | 181,411 | -1,360 | -0.74% | 43.4 |
| Madera CountyCalifornia · County equivalent · 06039 | 167,927 | +1,795 | +1.08% | 78.6 |
| Kings CountyCalifornia · County equivalent · 06031 | 154,327 | +208 | +0.13% | 110.9 |
| Napa CountyCalifornia · County equivalent · 06055 | 132,949 | -166 | -0.12% | 176.8 |
| Humboldt CountyCalifornia · County equivalent · 06023 | 131,647 | -677 | -0.51% | 36.9 |
| Nevada CountyCalifornia · County equivalent · 06057 | 101,911 | -235 | -0.23% | 106.4 |
| Sutter CountyCalifornia · County equivalent · 06101 | 98,787 | -146 | -0.15% | 163.9 |
| Yuba CountyCalifornia · County equivalent · 06115 | 88,691 | +1,250 | +1.43% | 140.3 |
| Mendocino CountyCalifornia · County equivalent · 06045 | 88,122 | -817 | -0.92% | 25.1 |
| San Benito CountyCalifornia · County equivalent · 06069 | 70,082 | +997 | +1.44% | 50.5 |
| Lake CountyCalifornia · County equivalent · 06033 | 67,772 | -108 | -0.16% | 54.0 |
| Tehama CountyCalifornia · County equivalent · 06103 | 64,665 | -102 | -0.16% | 21.9 |
| Tuolumne CountyCalifornia · County equivalent · 06109 | 53,160 | -1,025 | -1.89% | 23.9 |
| Calaveras CountyCalifornia · County equivalent · 06009 | 46,605 | +109 | +0.23% | 45.7 |
| Siskiyou CountyCalifornia · County equivalent · 06093 | 42,013 | -477 | -1.12% | 6.7 |
| Amador CountyCalifornia · County equivalent · 06005 | 41,876 | -98 | -0.23% | 70.4 |
| Glenn CountyCalifornia · County equivalent · 06021 | 28,141 | -179 | -0.63% | 21.4 |
| Lassen CountyCalifornia · County equivalent · 06035 | 28,117 | -476 | -1.66% | 6.2 |
| Del Norte CountyCalifornia · County equivalent · 06015 | 26,410 | -549 | -2.04% | 26.2 |
| Colusa CountyCalifornia · County equivalent · 06011 | 21,836 | -180 | -0.82% | 19.0 |
Use these comparisons consistently
A larger population does not necessarily mean faster growth. Absolute change measures the number of residents gained or lost; percentage change divides that difference by the starting population. The percentage column here covers one July-to-July interval, rather than a decade or a partial calendar year. Percent growth is suppressed where the starting population is zero.
Density divides the unrounded July 1, 2025 population by matching 2025 Gazetteer land area. It is measured in people per square mile and excludes water area. These geographic averages depend on the size and definition of each unit, so a county’s density is not directly comparable to a built-up city neighborhood.
County-equivalent names and units vary by state. Connecticut planning regions are represented in the current series; linking older county series requires a documented relationship. Incorporated places may cross county boundaries and do not form an exhaustive county breakdown.
Exports contain the current page’s visible rows after filtering, with reference date and release metadata. Use whole-dataset downloads for every row or select a compatible comparison to inspect a longer interval. The initial pep-2025-r1 snapshot remains reproducible when future releases are added.