State Cancer Profiles

Interpretation of Demographics Data

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

California

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Value (Percent) : The value is 22.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 8,632,796.
• Rank within US : This county is ranked 23 of 52

United States

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Value (Percent) : The value is 22.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 73,517,834.
• Rank within US : N/A

San Francisco County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 13.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 113,508.
• Rank within US : This county is ranked 3100 of 3143

Sierra County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 14.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 397.
• Rank within US : This county is ranked 3069 of 3143

Amador County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 15.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 6,389.
• Rank within US : This county is ranked 3017 of 3143

Calaveras County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 16.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 7,833.
• Rank within US : This county is ranked 2900 of 3143

Nevada County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 17,411.
• Rank within US : This county is ranked 2883 of 3143

Tuolumne County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 9,305.
• Rank within US : This county is ranked 2875 of 3143

Mariposa County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,941.
• Rank within US : This county is ranked 2858 of 3143

Plumas County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 3,336.
• Rank within US : This county is ranked 2858 of 3143

Trinity County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,727.
• Rank within US : This county is ranked 2858 of 3143

San Luis Obispo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 17.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 49,244.
• Rank within US : This county is ranked 2810 of 3143

Mono County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,329.
• Rank within US : This county is ranked 2775 of 3143

Santa Cruz County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 18.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 48,713.
• Rank within US : This county is ranked 2659 of 3143

Lassen County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 5,611.
• Rank within US : This county is ranked 2641 of 3143

Humboldt County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 25,301.
• Rank within US : This county is ranked 2580 of 3143

Sonoma County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 92,397.
• Rank within US : This county is ranked 2544 of 3143

Modoc County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 19.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,639.
• Rank within US : This county is ranked 2518 of 3143

Marin County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 49,986.
• Rank within US : This county is ranked 2426 of 3143

Napa County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 26,226.
• Rank within US : This county is ranked 2426 of 3143

El Dorado County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 37,633.
• Rank within US : This county is ranked 2404 of 3143

San Mateo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 145,095.
• Rank within US : This county is ranked 2404 of 3143

Alameda County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 326,276.
• Rank within US : This county is ranked 2323 of 3143

Alpine County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 19.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 321.
• Rank within US : This county is ranked 2294 of 3143

Siskiyou County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 20.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 8,690.
• Rank within US : This county is ranked 2262 of 3143

Yolo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 44,283.
• Rank within US : This county is ranked 2226 of 3143

Inyo County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 20.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 3,781.
• Rank within US : This county is ranked 2193 of 3143

Butte County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 42,452.
• Rank within US : This county is ranked 2129 of 3143

Santa Clara County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 390,076.
• Rank within US : This county is ranked 2095 of 3143

Los Angeles County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,019,140.
• Rank within US : This county is ranked 2055 of 3143

Del Norte County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 20.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 5,657.
• Rank within US : This county is ranked 1936 of 3143

Mendocino County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 20.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 18,897.
• Rank within US : This county is ranked 1936 of 3143

San Diego County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 687,317.
• Rank within US : This county is ranked 1936 of 3143

Orange County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 21.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 665,133.
• Rank within US : This county is ranked 1910 of 3143

Shasta County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 21.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 39,148.
• Rank within US : This county is ranked 1650 of 3143

Placer County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 21.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 91,287.
• Rank within US : This county is ranked 1576 of 3143

Ventura County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 21.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 182,707.
• Rank within US : This county is ranked 1576 of 3143

Lake County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 14,934.
• Rank within US : This county is ranked 1525 of 3143

Solano County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 21.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 98,830.
• Rank within US : This county is ranked 1525 of 3143

Contra Costa County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 22.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 256,000.
• Rank within US : This county is ranked 1478 of 3143

Santa Barbara County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 22.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 99,399.
• Rank within US : This county is ranked 1311 of 3143

Sacramento County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 22.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 364,525.
• Rank within US : This county is ranked 1096 of 3143

Riverside County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 24.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 597,369.
• Rank within US : This county is ranked 657 of 3143

Tehama County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 24.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 15,696.
• Rank within US : This county is ranked 657 of 3143

Sutter County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 25.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 24,874.
• Rank within US : This county is ranked 385 of 3143

San Benito County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 25.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 17,016.
• Rank within US : This county is ranked 362 of 3143

San Bernardino County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 25.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 560,378.
• Rank within US : This county is ranked 321 of 3143

Monterey County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 25.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 112,274.
• Rank within US : This county is ranked 296 of 3143

San Joaquin County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 208,824.
• Rank within US : This county is ranked 240 of 3143

Stanislaus County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 147,379.
• Rank within US : This county is ranked 203 of 3143

Glenn County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 26.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 7,622.
• Rank within US : This county is ranked 196 of 3143

Kings County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 41,126.
• Rank within US : This county is ranked 191 of 3143

Colusa County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 26.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 5,914.
• Rank within US : This county is ranked 184 of 3143

Madera County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 27.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 43,672.
• Rank within US : This county is ranked 172 of 3143

Yuba County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 27.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 22,964.
• Rank within US : This county is ranked 165 of 3143

Fresno County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 27.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 282,519.
• Rank within US : This county is ranked 138 of 3143

Imperial County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 51,054.
• Rank within US : This county is ranked 121 of 3143

Kern County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 261,490.
• Rank within US : This county is ranked 113 of 3143

Merced County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 83,330.
• Rank within US : This county is ranked 109 of 3143

Tulare County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 29.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 142,421.
• Rank within US : This county is ranked 78 of 3143

Notes:
Created by statecancerprofiles.cancer.gov on 03/21/2026 8:39 pm.

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.