State Cancer Profiles

Interpretation of Demographics Data

Demographic Data Report for California by County
Population: Age under 18
All Races (includes Hispanic), Both Sexes
2019-2023 American Community Survey 5-Year Data
Sorted by Rank

California

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Value (Percent) : The value is 22.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 8,729,012.
• Rank within US : This state is ranked 23 of 52

United States

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Value (Percent) : The value is 22.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 73,645,238.
• Rank within US : N/A

Sierra County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 12.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 349.
• Rank within US : This county is ranked 3111 of 3143

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 114,728.
• Rank within US : This county is ranked 3100 of 3143

Amador County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 15.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 6,356.
• Rank within US : This county is ranked 3036 of 3143

Mariposa County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 16.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,874.
• Rank within US : This county is ranked 2927 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 7,768.
• Rank within US : This county is ranked 2917 of 3143

Nevada 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 17,514.
• Rank within US : This county is ranked 2892 of 3143

Tuolumne 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 9,428.
• Rank within US : This county is ranked 2882 of 3143

Plumas County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 3,430.
• Rank within US : This county is ranked 2844 of 3143

San Luis Obispo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 17.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 49,564.
• Rank within US : This county is ranked 2835 of 3143

Lassen County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 17.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 5,580.
• Rank within US : This county is ranked 2778 of 3143

Trinity County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,912.
• Rank within US : This county is ranked 2702 of 3143

Mono County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,419.
• Rank within US : This county is ranked 2684 of 3143

Santa Cruz County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 18.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 49,902.
• Rank within US : This county is ranked 2608 of 3143

Humboldt County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 19.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 25,685.
• Rank within US : This county is ranked 2557 of 3143

Modoc County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 19.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,661.
• Rank within US : This county is ranked 2514 of 3143

Sonoma County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 93,938.
• Rank within US : This county is ranked 2489 of 3143

El Dorado County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 37,917.
• Rank within US : This county is ranked 2378 of 3143

Marin County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 51,012.
• Rank within US : This county is ranked 2378 of 3143

Napa County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 27,023.
• Rank within US : This county is ranked 2329 of 3143

San Mateo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 19.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 148,064.
• Rank within US : This county is ranked 2329 of 3143

Alameda County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 331,035.
• Rank within US : This county is ranked 2300 of 3143

Siskiyou County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 20.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 8,827.
• Rank within US : This county is ranked 2274 of 3143

Inyo County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 20.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 3,819.
• Rank within US : This county is ranked 2213 of 3143

Butte 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 42,935.
• Rank within US : This county is ranked 2151 of 3143

Yolo 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 44,638.
• Rank within US : This county is ranked 2151 of 3143

Los Angeles 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 2,057,536.
• Rank within US : This county is ranked 2008 of 3143

Del Norte County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 5,728.
• Rank within US : This county is ranked 1977 of 3143

Santa Clara 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 398,753.
• Rank within US : This county is ranked 1977 of 3143

Mendocino County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 19,142.
• 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 21.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 694,169.
• Rank within US : This county is ranked 1936 of 3143

Orange County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 21.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 674,833.
• Rank within US : This county is ranked 1876 of 3143

Shasta County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 21.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 39,404.
• Rank within US : This county is ranked 1683 of 3143

Lake County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 14,828.
• Rank within US : This county is ranked 1646 of 3143

Placer 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 90,610.
• Rank within US : This county is ranked 1567 of 3143

Solano County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 22.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 99,424.
• Rank within US : This county is ranked 1518 of 3143

Contra Costa County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 22.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 258,092.
• Rank within US : This county is ranked 1469 of 3143

Ventura County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 22.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 185,795.
• Rank within US : This county is ranked 1469 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 99,608.
• Rank within US : This county is ranked 1385 of 3143

Alpine County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 22.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 383.
• Rank within US : This county is ranked 1288 of 3143

Sacramento County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 23.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 365,667.
• Rank within US : This county is ranked 1087 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 15,783.
• Rank within US : This county is ranked 687 of 3143

Riverside County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 24.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 598,671.
• Rank within US : This county is ranked 594 of 3143

Sutter County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 25.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 25,168.
• Rank within US : This county is ranked 378 of 3143

San Benito 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 16,820.
• Rank within US : This county is ranked 355 of 3143

San Bernardino County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 25.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 563,979.
• Rank within US : This county is ranked 315 of 3143

Monterey County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 113,201.
• Rank within US : This county is ranked 281 of 3143

Glenn County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 26.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 7,501.
• Rank within US : This county is ranked 259 of 3143

San Joaquin County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 208,930.
• Rank within US : This county is ranked 234 of 3143

Stanislaus County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 148,315.
• Rank within US : This county is ranked 204 of 3143

Kings 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 41,374.
• Rank within US : This county is ranked 187 of 3143

Colusa County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 27.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 5,987.
• Rank within US : This county is ranked 176 of 3143

Yuba County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 27.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 22,640.
• Rank within US : This county is ranked 176 of 3143

Madera County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 27.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 43,447.
• Rank within US : This county is ranked 173 of 3143

Fresno County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 283,823.
• Rank within US : This county is ranked 136 of 3143

Imperial County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 51,116.
• Rank within US : This county is ranked 121 of 3143

Kern County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 262,550.
• Rank within US : This county is ranked 115 of 3143

Merced County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 29.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 83,242.
• Rank within US : This county is ranked 103 of 3143

Tulare County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 30.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 143,115.
• Rank within US : This county is ranked 74 of 3143

Notes:
Created by statecancerprofiles.cancer.gov on 07/11/2025 11:39 pm.

Φ Rural-Urban Continuum Codes provided by the USDA.

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.