Demographics Table
Demographic Data Report for California by County
Population: Age under 18
All Races (includes Hispanic), Both Sexes
2020-2024 American Community Survey 5-Year Data
Sorted by Percent
County
|
2023 Rural-Urban Continuum Codes Φ
|
Value (Percent)
|
People (Age Under 18)
|
Rank within US (of 3143 counties)
|
|---|---|---|---|---|
| California | N/A | 22.0 | 8,632,796 | 23 of 52 |
| United States | N/A | 22.0 | 73,517,834 | N/A |
| San Francisco County | Urban | 13.7 | 113,508 | 3,100 |
| Sierra County | Rural | 14.5 | 397 | 3,069 |
| Amador County | Rural | 15.4 | 6,389 | 3,017 |
| Calaveras County | Rural | 16.9 | 7,833 | 2,900 |
| Nevada County | Rural | 17.0 | 17,411 | 2,883 |
| Tuolumne County | Rural | 17.1 | 9,305 | 2,875 |
| Mariposa County | Rural | 17.2 | 2,941 | 2,858 |
| Plumas County | Rural | 17.2 | 3,336 | 2,858 |
| Trinity County | Rural | 17.2 | 2,727 | 2,858 |
| San Luis Obispo County | Urban | 17.5 | 49,244 | 2,810 |
| Mono County | Rural | 17.7 | 2,329 | 2,775 |
| Santa Cruz County | Urban | 18.4 | 48,713 | 2,659 |
| Lassen County | Rural | 18.5 | 5,611 | 2,641 |
| Humboldt County | Rural | 18.8 | 25,301 | 2,580 |
| Sonoma County | Urban | 19.0 | 92,397 | 2,544 |
| Modoc County | Rural | 19.1 | 1,639 | 2,518 |
| Marin County | Urban | 19.4 | 49,986 | 2,426 |
| Napa County | Urban | 19.4 | 26,226 | 2,426 |
| El Dorado County | Urban | 19.5 | 37,633 | 2,404 |
| San Mateo County | Urban | 19.5 | 145,095 | 2,404 |
| Alameda County | Urban | 19.8 | 326,276 | 2,323 |
| Alpine County | Rural | 19.9 | 321 | 2,294 |
| Siskiyou County | Rural | 20.0 | 8,690 | 2,262 |
| Yolo County | Urban | 20.1 | 44,283 | 2,226 |
| Inyo County | Rural | 20.2 | 3,781 | 2,193 |
| Butte County | Urban | 20.4 | 42,452 | 2,129 |
| Santa Clara County | Urban | 20.5 | 390,076 | 2,095 |
| Los Angeles County | Urban | 20.6 | 2,019,140 | 2,055 |
| Del Norte County | Rural | 20.9 | 5,657 | 1,936 |
| Mendocino County | Rural | 20.9 | 18,897 | 1,936 |
| San Diego County | Urban | 20.9 | 687,317 | 1,936 |
| Orange County | Urban | 21.0 | 665,133 | 1,910 |
| Shasta County | Urban | 21.6 | 39,148 | 1,650 |
| Placer County | Urban | 21.8 | 91,287 | 1,576 |
| Ventura County | Urban | 21.8 | 182,707 | 1,576 |
| Lake County | Rural | 21.9 | 14,934 | 1,525 |
| Solano County | Urban | 21.9 | 98,830 | 1,525 |
| Contra Costa County | Urban | 22.0 | 256,000 | 1,478 |
| Santa Barbara County | Urban | 22.4 | 99,399 | 1,311 |
| Sacramento County | Urban | 22.9 | 364,525 | 1,096 |
| Riverside County | Urban | 24.1 | 597,369 | 657 |
| Tehama County | Rural | 24.1 | 15,696 | 657 |
| Sutter County | Urban | 25.2 | 24,874 | 385 |
| San Benito County | Urban | 25.3 | 17,016 | 362 |
| San Bernardino County | Urban | 25.5 | 560,378 | 321 |
| Monterey County | Urban | 25.7 | 112,274 | 296 |
| San Joaquin County | Urban | 26.2 | 208,824 | 240 |
| Stanislaus County | Urban | 26.6 | 147,379 | 203 |
| Glenn County | Rural | 26.7 | 7,622 | 196 |
| Kings County | Urban | 26.8 | 41,126 | 191 |
| Colusa County | Rural | 26.9 | 5,914 | 184 |
| Madera County | Urban | 27.1 | 43,672 | 172 |
| Yuba County | Urban | 27.2 | 22,964 | 165 |
| Fresno County | Urban | 27.8 | 282,519 | 138 |
| Imperial County | Urban | 28.3 | 51,054 | 121 |
| Kern County | Urban | 28.6 | 261,490 | 113 |
| Merced County | Urban | 28.7 | 83,330 | 109 |
| Tulare County | Urban | 29.8 | 142,421 | 78 |
Notes:
Created by statecancerprofiles.cancer.gov on 03/21/2026 5:46 am.
Φ Rural–urban county classifications are based on the 2023 USDA Rural–Urban Continuum Codes (except for Connecticut Counties which use 2013 codes). State-level cancer rates for rural areas are calculated using cancer cases registered exclusively in rural counties, while state-level cancer rates for urban areas are calculated using cases registered exclusively in urban counties.
Source: Demographic data provided by the Census Bureau and the American Community Survey.
For more information about Population: Age under 18, see the dictionary.
Data for United States does not include Puerto Rico.