Demographics Table
Demographic Data Report for California by County
Population: Age 18-39
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 18-39)
|
Rank within US (of 3143 counties)
|
|---|---|---|---|---|
| California | N/A | 31.0 | 12,187,670 | 8 of 52 |
| United States | N/A | 29.5 | 98,945,767 | N/A |
| Sierra County | Rural | 14.1 | 388 | 3,136 |
| Alpine County | Rural | 30.8 | 497 | 400 |
| Modoc County | Rural | 22.4 | 1,928 | 2,634 |
| Trinity County | Rural | 18.0 | 2,861 | 3,068 |
| Mariposa County | Rural | 20.5 | 3,497 | 2,913 |
| Mono County | Rural | 28.8 | 3,782 | 703 |
| Plumas County | Rural | 21.6 | 4,196 | 2,769 |
| Inyo County | Rural | 22.6 | 4,228 | 2,590 |
| Colusa County | Rural | 27.9 | 6,128 | 884 |
| Glenn County | Rural | 27.1 | 7,726 | 1,112 |
| Del Norte County | Rural | 29.2 | 7,921 | 615 |
| Siskiyou County | Rural | 21.9 | 9,513 | 2,723 |
| Calaveras County | Rural | 21.1 | 9,747 | 2,837 |
| Amador County | Rural | 23.5 | 9,754 | 2,338 |
| Lassen County | Rural | 33.6 | 10,209 | 211 |
| Tuolumne County | Rural | 23.7 | 12,909 | 2,289 |
| Lake County | Rural | 22.9 | 15,613 | 2,508 |
| Tehama County | Rural | 26.0 | 16,914 | 1,485 |
| San Benito County | Urban | 31.1 | 20,954 | 369 |
| Mendocino County | Rural | 23.7 | 21,407 | 2,289 |
| Nevada County | Rural | 21.9 | 22,419 | 2,723 |
| Yuba County | Urban | 32.3 | 27,300 | 271 |
| Sutter County | Urban | 28.9 | 28,539 | 676 |
| Napa County | Urban | 26.7 | 36,051 | 1,232 |
| Humboldt County | Rural | 31.3 | 42,164 | 349 |
| El Dorado County | Urban | 23.0 | 44,311 | 2,479 |
| Shasta County | Urban | 25.9 | 46,924 | 1,522 |
| Madera County | Urban | 29.9 | 48,069 | 490 |
| Marin County | Urban | 20.9 | 53,823 | 2,871 |
| Kings County | Urban | 35.4 | 54,275 | 141 |
| Imperial County | Urban | 30.9 | 55,631 | 385 |
| Butte County | Urban | 34.2 | 71,066 | 189 |
| Santa Cruz County | Urban | 31.8 | 84,332 | 304 |
| Yolo County | Urban | 40.0 | 88,245 | 57 |
| San Luis Obispo County | Urban | 32.1 | 90,356 | 283 |
| Merced County | Urban | 32.7 | 94,917 | 250 |
| Placer County | Urban | 24.5 | 102,847 | 2,046 |
| Sonoma County | Urban | 26.7 | 129,467 | 1,232 |
| Monterey County | Urban | 30.1 | 131,760 | 468 |
| Solano County | Urban | 29.3 | 132,339 | 594 |
| Tulare County | Urban | 31.2 | 149,543 | 357 |
| Santa Barbara County | Urban | 33.8 | 149,788 | 200 |
| Stanislaus County | Urban | 30.5 | 168,984 | 426 |
| San Mateo County | Urban | 29.1 | 216,268 | 638 |
| Ventura County | Urban | 28.7 | 240,000 | 723 |
| San Joaquin County | Urban | 30.3 | 241,445 | 445 |
| Kern County | Urban | 31.8 | 291,367 | 304 |
| San Francisco County | Urban | 36.3 | 301,545 | 111 |
| Contra Costa County | Urban | 27.2 | 317,079 | 1,081 |
| Fresno County | Urban | 31.6 | 320,894 | 321 |
| Sacramento County | Urban | 30.9 | 493,081 | 385 |
| Alameda County | Urban | 31.7 | 523,220 | 314 |
| Santa Clara County | Urban | 32.3 | 615,068 | 271 |
| San Bernardino County | Urban | 31.9 | 700,704 | 296 |
| Riverside County | Urban | 29.9 | 741,610 | 490 |
| Orange County | Urban | 29.7 | 940,679 | 525 |
| San Diego County | Urban | 33.1 | 1,088,026 | 239 |
| Los Angeles County | Urban | 31.9 | 3,133,362 | 296 |
Notes:
Created by statecancerprofiles.cancer.gov on 03/23/2026 10:02 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 18-39, see the dictionary.
Data for United States does not include Puerto Rico.