Demographics Table
Demographic Data Report for California by County
Population: Age 40 and over
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 40 And Over)
|
Rank within US (of 3143 counties)
|
|---|---|---|---|---|
| United States | N/A | 48.5 | 162,458,898 | N/A |
| California | N/A | 47.0 | 18,466,911 | 41 of 52 |
| Sierra County | Rural | 71.4 | 1,961 | 12 |
| Trinity County | Rural | 64.8 | 10,272 | 79 |
| Mariposa County | Rural | 62.3 | 10,644 | 158 |
| Calaveras County | Rural | 62.0 | 28,668 | 167 |
| Plumas County | Rural | 61.2 | 11,891 | 207 |
| Nevada County | Rural | 61.1 | 62,651 | 210 |
| Amador County | Rural | 61.0 | 25,285 | 217 |
| Marin County | Urban | 59.8 | 154,160 | 285 |
| Tuolumne County | Rural | 59.2 | 32,284 | 334 |
| Modoc County | Rural | 58.5 | 5,033 | 389 |
| Siskiyou County | Rural | 58.1 | 25,263 | 434 |
| El Dorado County | Urban | 57.5 | 110,718 | 497 |
| Inyo County | Rural | 57.3 | 10,730 | 527 |
| Mendocino County | Rural | 55.3 | 49,940 | 799 |
| Lake County | Rural | 55.2 | 37,605 | 824 |
| Sonoma County | Urban | 54.3 | 263,176 | 993 |
| Napa County | Urban | 53.8 | 72,592 | 1,103 |
| Placer County | Urban | 53.7 | 225,022 | 1,138 |
| Mono County | Rural | 53.5 | 7,037 | 1,177 |
| Shasta County | Urban | 52.6 | 95,364 | 1,379 |
| San Mateo County | Urban | 51.3 | 380,977 | 1,728 |
| Contra Costa County | Urban | 50.8 | 591,933 | 1,836 |
| San Luis Obispo County | Urban | 50.4 | 141,955 | 1,939 |
| San Francisco County | Urban | 50.0 | 415,182 | 2,034 |
| Tehama County | Rural | 50.0 | 32,557 | 2,034 |
| Del Norte County | Rural | 49.9 | 13,529 | 2,056 |
| Humboldt County | Rural | 49.9 | 67,076 | 2,056 |
| Santa Cruz County | Urban | 49.8 | 131,881 | 2,079 |
| Ventura County | Urban | 49.5 | 414,762 | 2,137 |
| Alpine County | Rural | 49.4 | 798 | 2,164 |
| Orange County | Urban | 49.3 | 1,560,008 | 2,185 |
| Solano County | Urban | 48.8 | 220,749 | 2,287 |
| Alameda County | Urban | 48.5 | 799,977 | 2,339 |
| Lassen County | Rural | 47.9 | 14,536 | 2,429 |
| Los Angeles County | Urban | 47.5 | 4,656,165 | 2,485 |
| Santa Clara County | Urban | 47.2 | 896,903 | 2,527 |
| Sacramento County | Urban | 46.2 | 736,400 | 2,650 |
| Glenn County | Rural | 46.1 | 13,146 | 2,657 |
| Riverside County | Urban | 46.0 | 1,139,621 | 2,666 |
| San Diego County | Urban | 46.0 | 1,513,431 | 2,666 |
| Sutter County | Urban | 46.0 | 45,444 | 2,666 |
| Butte County | Urban | 45.4 | 94,411 | 2,736 |
| Colusa County | Rural | 45.2 | 9,942 | 2,758 |
| Monterey County | Urban | 44.2 | 193,579 | 2,824 |
| Santa Barbara County | Urban | 43.8 | 194,514 | 2,852 |
| San Benito County | Urban | 43.6 | 29,320 | 2,872 |
| San Joaquin County | Urban | 43.5 | 347,065 | 2,881 |
| Madera County | Urban | 43.0 | 69,199 | 2,906 |
| Stanislaus County | Urban | 42.9 | 237,627 | 2,911 |
| San Bernardino County | Urban | 42.6 | 936,022 | 2,920 |
| Imperial County | Urban | 40.8 | 73,517 | 2,999 |
| Fresno County | Urban | 40.7 | 413,312 | 3,003 |
| Yuba County | Urban | 40.5 | 34,243 | 3,010 |
| Yolo County | Urban | 39.9 | 88,036 | 3,033 |
| Kern County | Urban | 39.6 | 362,218 | 3,038 |
| Tulare County | Urban | 39.0 | 186,729 | 3,055 |
| Merced County | Urban | 38.6 | 111,954 | 3,071 |
| Kings County | Urban | 37.8 | 57,897 | 3,089 |
Notes:
Created by statecancerprofiles.cancer.gov on 03/29/2026 4:56 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 40 and over, see the dictionary.
Data for United States does not include Puerto Rico.