# Counties in California by population density, 2025

All 58 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_density`
- Unit: inhabitants per km²
- Definition: Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.
- Source: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km² (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-09
- Citation: U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.
- Web page: https://invokely.ai/rankings/population-density/california-counties
- CSV: https://invokely.ai/download/rankings/population-density/california-counties.csv

| Rank | Place | inhabitants per km² |
|---:|---|---:|
| 1 | San Francisco County | 6,832 |
| 2 | Orange County | 1,533 |
| 3 | Los Angeles County | 921.9 |
| 4 | Alameda County | 856.9 |
| 5 | Sacramento County | 647.3 |
| 6 | San Mateo County | 640 |
| 7 | Contra Costa County | 630.2 |
| 8 | Santa Clara County | 572.5 |
| 9 | San Diego County | 301 |
| 10 | San Joaquin County | 228.5 |
| 11 | Santa Cruz County | 224.5 |
| 12 | Solano County | 214 |
| 13 | Marin County | 188.3 |
| 14 | Ventura County | 174.3 |
| 15 | Stanislaus County | 143.9 |
| 16 | Riverside County | 136.3 |
| 17 | Placer County | 121.3 |
| 18 | Sonoma County | 119.2 |
| 19 | Yolo County | 85.5 |
| 20 | Napa County | 68.3 |
| 21 | Fresno County | 67.1 |
| 22 | Sutter County | 63.3 |
| 23 | Santa Barbara County | 62.4 |
| 24 | Merced County | 59.2 |
| 25 | Yuba County | 54.2 |
| 26 | Monterey County | 51 |
| 27 | Butte County | 49.4 |
| 28 | Kern County | 44 |
| 29 | El Dorado County | 43.5 |
| 30 | Kings County | 42.8 |
| 31 | San Bernardino County | 42.8 |
| 32 | Nevada County | 41.1 |
| 33 | Tulare County | 38.8 |
| 34 | San Luis Obispo County | 33 |
| 35 | Madera County | 30.3 |
| 36 | Amador County | 27.2 |
| 37 | Lake County | 20.8 |
| 38 | San Benito County | 19.5 |
| 39 | Shasta County | 18.6 |
| 40 | Calaveras County | 17.6 |
| 41 | Imperial County | 16.8 |
| 42 | Humboldt County | 14.2 |
| 43 | Del Norte County | 10.1 |
| 44 | Mendocino County | 9.7 |
| 45 | Tuolumne County | 9.2 |
| 46 | Tehama County | 8.5 |
| 47 | Glenn County | 8.3 |
| 48 | Colusa County | 7.3 |
| 49 | Mariposa County | 4.5 |
| 50 | Plumas County | 2.8 |
| 51 | Siskiyou County | 2.6 |
| 52 | Lassen County | 2.4 |
| 53 | Trinity County | 1.9 |
| 54 | Mono County | 1.6 |
| 55 | Sierra County | 1.3 |
| 56 | Modoc County | 0.8 |
| 57 | Inyo County | 0.7 |
| 58 | Alpine County | 0.5 |