State Cancer Profiles

Interpretation of Demographics Data

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

United States

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Value (Percent) : The value is 29.5 percent.
• People (Age 18-39) : The number of people (age 18-39) is 98,945,767.
• Rank within US : N/A

California

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Value (Percent) : The value is 31.0 percent.
• People (Age 18-39) : The number of people (age 18-39) is 12,187,670.
• Rank within US : This county is ranked 8 of 52

Sierra County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 14.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 388.
• Rank within US : This county is ranked 3136 of 3143

Trinity County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.0 percent.
• People (Age 18-39) : The number of people (age 18-39) is 2,861.
• Rank within US : This county is ranked 3068 of 3143

Mariposa County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 20.5 percent.
• People (Age 18-39) : The number of people (age 18-39) is 3,497.
• Rank within US : This county is ranked 2913 of 3143

Marin County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 53,823.
• Rank within US : This county is ranked 2871 of 3143

Calaveras County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 9,747.
• Rank within US : This county is ranked 2837 of 3143

Plumas County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.6 percent.
• People (Age 18-39) : The number of people (age 18-39) is 4,196.
• Rank within US : This county is ranked 2769 of 3143

Nevada County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 22,419.
• Rank within US : This county is ranked 2723 of 3143

Siskiyou County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 9,513.
• Rank within US : This county is ranked 2723 of 3143

Modoc County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 22.4 percent.
• People (Age 18-39) : The number of people (age 18-39) is 1,928.
• Rank within US : This county is ranked 2634 of 3143

Inyo County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 22.6 percent.
• People (Age 18-39) : The number of people (age 18-39) is 4,228.
• Rank within US : This county is ranked 2590 of 3143

Lake County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 22.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 15,613.
• Rank within US : This county is ranked 2508 of 3143

El Dorado County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 23.0 percent.
• People (Age 18-39) : The number of people (age 18-39) is 44,311.
• Rank within US : This county is ranked 2479 of 3143

Amador County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 23.5 percent.
• People (Age 18-39) : The number of people (age 18-39) is 9,754.
• Rank within US : This county is ranked 2338 of 3143

Mendocino County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 23.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 21,407.
• Rank within US : This county is ranked 2289 of 3143

Tuolumne County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 23.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 12,909.
• Rank within US : This county is ranked 2289 of 3143

Placer County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 24.5 percent.
• People (Age 18-39) : The number of people (age 18-39) is 102,847.
• Rank within US : This county is ranked 2046 of 3143

Shasta County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 25.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 46,924.
• Rank within US : This county is ranked 1522 of 3143

Tehama County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 26.0 percent.
• People (Age 18-39) : The number of people (age 18-39) is 16,914.
• Rank within US : This county is ranked 1485 of 3143

Napa County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 36,051.
• Rank within US : This county is ranked 1232 of 3143

Sonoma County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 26.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 129,467.
• Rank within US : This county is ranked 1232 of 3143

Glenn County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 27.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 7,726.
• Rank within US : This county is ranked 1112 of 3143

Contra Costa County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 27.2 percent.
• People (Age 18-39) : The number of people (age 18-39) is 317,079.
• Rank within US : This county is ranked 1081 of 3143

Colusa County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 27.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 6,128.
• Rank within US : This county is ranked 884 of 3143

Ventura County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 240,000.
• Rank within US : This county is ranked 723 of 3143

Mono County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 28.8 percent.
• People (Age 18-39) : The number of people (age 18-39) is 3,782.
• Rank within US : This county is ranked 703 of 3143

Sutter County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 28.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 28,539.
• Rank within US : This county is ranked 676 of 3143

San Mateo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 29.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 216,268.
• Rank within US : This county is ranked 638 of 3143

Del Norte County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 29.2 percent.
• People (Age 18-39) : The number of people (age 18-39) is 7,921.
• Rank within US : This county is ranked 615 of 3143

Solano County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 29.3 percent.
• People (Age 18-39) : The number of people (age 18-39) is 132,339.
• Rank within US : This county is ranked 594 of 3143

Orange County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 29.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 940,679.
• Rank within US : This county is ranked 525 of 3143

Madera County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 29.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 48,069.
• Rank within US : This county is ranked 490 of 3143

Riverside County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 29.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 741,610.
• Rank within US : This county is ranked 490 of 3143

Monterey County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 30.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 131,760.
• Rank within US : This county is ranked 468 of 3143

San Joaquin County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 30.3 percent.
• People (Age 18-39) : The number of people (age 18-39) is 241,445.
• Rank within US : This county is ranked 445 of 3143

Stanislaus County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 30.5 percent.
• People (Age 18-39) : The number of people (age 18-39) is 168,984.
• Rank within US : This county is ranked 426 of 3143

Alpine County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 30.8 percent.
• People (Age 18-39) : The number of people (age 18-39) is 497.
• Rank within US : This county is ranked 400 of 3143

Imperial County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 30.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 55,631.
• Rank within US : This county is ranked 385 of 3143

Sacramento County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 30.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 493,081.
• 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 31.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 20,954.
• Rank within US : This county is ranked 369 of 3143

Tulare County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 31.2 percent.
• People (Age 18-39) : The number of people (age 18-39) is 149,543.
• Rank within US : This county is ranked 357 of 3143

Humboldt County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 31.3 percent.
• People (Age 18-39) : The number of people (age 18-39) is 42,164.
• Rank within US : This county is ranked 349 of 3143

Fresno County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 31.6 percent.
• People (Age 18-39) : The number of people (age 18-39) is 320,894.
• Rank within US : This county is ranked 321 of 3143

Alameda County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 31.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 523,220.
• Rank within US : This county is ranked 314 of 3143

Kern County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 31.8 percent.
• People (Age 18-39) : The number of people (age 18-39) is 291,367.
• Rank within US : This county is ranked 304 of 3143

Santa Cruz County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 31.8 percent.
• People (Age 18-39) : The number of people (age 18-39) is 84,332.
• Rank within US : This county is ranked 304 of 3143

Los Angeles County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 31.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 3,133,362.
• Rank within US : This county is ranked 296 of 3143

San Bernardino County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 31.9 percent.
• People (Age 18-39) : The number of people (age 18-39) is 700,704.
• Rank within US : This county is ranked 296 of 3143

San Luis Obispo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 32.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 90,356.
• Rank within US : This county is ranked 283 of 3143

Santa Clara County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 32.3 percent.
• People (Age 18-39) : The number of people (age 18-39) is 615,068.
• Rank within US : This county is ranked 271 of 3143

Yuba County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 32.3 percent.
• People (Age 18-39) : The number of people (age 18-39) is 27,300.
• Rank within US : This county is ranked 271 of 3143

Merced County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 32.7 percent.
• People (Age 18-39) : The number of people (age 18-39) is 94,917.
• Rank within US : This county is ranked 250 of 3143

San Diego County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 33.1 percent.
• People (Age 18-39) : The number of people (age 18-39) is 1,088,026.
• Rank within US : This county is ranked 239 of 3143

Lassen County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 33.6 percent.
• People (Age 18-39) : The number of people (age 18-39) is 10,209.
• Rank within US : This county is ranked 211 of 3143

Santa Barbara County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 33.8 percent.
• People (Age 18-39) : The number of people (age 18-39) is 149,788.
• Rank within US : This county is ranked 200 of 3143

Butte County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 34.2 percent.
• People (Age 18-39) : The number of people (age 18-39) is 71,066.
• Rank within US : This county is ranked 189 of 3143

Kings County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 35.4 percent.
• People (Age 18-39) : The number of people (age 18-39) is 54,275.
• Rank within US : This county is ranked 141 of 3143

San Francisco County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 36.3 percent.
• People (Age 18-39) : The number of people (age 18-39) is 301,545.
• Rank within US : This county is ranked 111 of 3143

Yolo County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 40.0 percent.
• People (Age 18-39) : The number of people (age 18-39) is 88,245.
• Rank within US : This county is ranked 57 of 3143

Notes:
Created by statecancerprofiles.cancer.gov on 03/26/2026 9:56 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 18-39, see the dictionary.

Data for United States does not include Puerto Rico.