Interpretation of Demographics Data
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
United States
- 2023 Rural-Urban Continuum Codes Φ : N/A
- Value (Percent) : The value is 48.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 162,458,898.
- Rank within US : N/A
California
- 2023 Rural-Urban Continuum Codes Φ : N/A
- Value (Percent) : The value is 47.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 18,466,911.
- Rank within US : This county is ranked 41 of 52
Sierra County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 71.4 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 1,961.
- Rank within US : This county is ranked 12 of 3143
Trinity County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 64.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 10,272.
- Rank within US : This county is ranked 79 of 3143
Mariposa County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 62.3 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 10,644.
- Rank within US : This county is ranked 158 of 3143
Calaveras County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 62.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 28,668.
- Rank within US : This county is ranked 167 of 3143
Plumas County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 61.2 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 11,891.
- Rank within US : This county is ranked 207 of 3143
Nevada County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 61.1 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 62,651.
- Rank within US : This county is ranked 210 of 3143
Amador County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 61.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 25,285.
- Rank within US : This county is ranked 217 of 3143
Marin County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 59.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 154,160.
- Rank within US : This county is ranked 285 of 3143
Tuolumne County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 59.2 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 32,284.
- Rank within US : This county is ranked 334 of 3143
Modoc County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 58.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 5,033.
- Rank within US : This county is ranked 389 of 3143
Siskiyou County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 58.1 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 25,263.
- Rank within US : This county is ranked 434 of 3143
El Dorado County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 57.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 110,718.
- Rank within US : This county is ranked 497 of 3143
Inyo County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 57.3 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 10,730.
- Rank within US : This county is ranked 527 of 3143
Mendocino County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 55.3 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 49,940.
- Rank within US : This county is ranked 799 of 3143
Lake County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 55.2 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 37,605.
- Rank within US : This county is ranked 824 of 3143
Sonoma County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 54.3 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 263,176.
- Rank within US : This county is ranked 993 of 3143
Napa County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 53.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 72,592.
- Rank within US : This county is ranked 1103 of 3143
Placer County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 53.7 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 225,022.
- Rank within US : This county is ranked 1138 of 3143
Mono County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 53.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 7,037.
- Rank within US : This county is ranked 1177 of 3143
Shasta County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 52.6 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 95,364.
- Rank within US : This county is ranked 1379 of 3143
San Mateo County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 51.3 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 380,977.
- Rank within US : This county is ranked 1728 of 3143
Contra Costa County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 50.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 591,933.
- Rank within US : This county is ranked 1836 of 3143
San Luis Obispo County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 50.4 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 141,955.
- Rank within US : This county is ranked 1939 of 3143
San Francisco County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 50.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 415,182.
- Rank within US : This county is ranked 2034 of 3143
Tehama County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 50.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 32,557.
- Rank within US : This county is ranked 2034 of 3143
Del Norte County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 49.9 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 13,529.
- Rank within US : This county is ranked 2056 of 3143
Humboldt County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 49.9 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 67,076.
- Rank within US : This county is ranked 2056 of 3143
Santa Cruz County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 49.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 131,881.
- Rank within US : This county is ranked 2079 of 3143
Ventura County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 49.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 414,762.
- Rank within US : This county is ranked 2137 of 3143
Alpine County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 49.4 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 798.
- Rank within US : This county is ranked 2164 of 3143
Orange County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 49.3 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 1,560,008.
- Rank within US : This county is ranked 2185 of 3143
Solano County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 48.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 220,749.
- Rank within US : This county is ranked 2287 of 3143
Alameda County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 48.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 799,977.
- Rank within US : This county is ranked 2339 of 3143
Lassen County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 47.9 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 14,536.
- Rank within US : This county is ranked 2429 of 3143
Los Angeles County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 47.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 4,656,165.
- Rank within US : This county is ranked 2485 of 3143
Santa Clara County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 47.2 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 896,903.
- Rank within US : This county is ranked 2527 of 3143
Sacramento County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 46.2 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 736,400.
- Rank within US : This county is ranked 2650 of 3143
Glenn County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 46.1 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 13,146.
- Rank within US : This county is ranked 2657 of 3143
Riverside County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 46.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 1,139,621.
- Rank within US : This county is ranked 2666 of 3143
San Diego County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 46.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 1,513,431.
- Rank within US : This county is ranked 2666 of 3143
Sutter County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 46.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 45,444.
- Rank within US : This county is ranked 2666 of 3143
Butte County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 45.4 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 94,411.
- Rank within US : This county is ranked 2736 of 3143
Colusa County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 45.2 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 9,942.
- Rank within US : This county is ranked 2758 of 3143
Monterey County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 44.2 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 193,579.
- Rank within US : This county is ranked 2824 of 3143
Santa Barbara County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 43.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 194,514.
- Rank within US : This county is ranked 2852 of 3143
San Benito County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 43.6 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 29,320.
- Rank within US : This county is ranked 2872 of 3143
San Joaquin County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 43.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 347,065.
- Rank within US : This county is ranked 2881 of 3143
Madera County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 43.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 69,199.
- Rank within US : This county is ranked 2906 of 3143
Stanislaus County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 42.9 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 237,627.
- Rank within US : This county is ranked 2911 of 3143
San Bernardino County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 42.6 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 936,022.
- Rank within US : This county is ranked 2920 of 3143
Imperial County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 40.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 73,517.
- Rank within US : This county is ranked 2999 of 3143
Fresno County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 40.7 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 413,312.
- Rank within US : This county is ranked 3003 of 3143
Yuba County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 40.5 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 34,243.
- Rank within US : This county is ranked 3010 of 3143
Yolo County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 39.9 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 88,036.
- Rank within US : This county is ranked 3033 of 3143
Kern County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 39.6 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 362,218.
- Rank within US : This county is ranked 3038 of 3143
Tulare County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 39.0 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 186,729.
- Rank within US : This county is ranked 3055 of 3143
Merced County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 38.6 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 111,954.
- Rank within US : This county is ranked 3071 of 3143
Kings County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 37.8 percent.
- People (Age 40 And Over) : The number of people (age 40 and over) is 57,897.
- Rank within US : This county is ranked 3089 of 3143
Notes:
Created by statecancerprofiles.cancer.gov on 03/30/2026 12:35 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.