Interpretation of Demographics Data
Demographic Data Report for Idaho by County
Population: Age under 18
All Races (includes Hispanic), Both Sexes
2020-2024 American Community Survey 5-Year Data
Sorted by Percent
Idaho
- 2023 Rural-Urban Continuum Codes Φ : N/A
- Value (Percent) : The value is 24.1 percent.
- People (Age Under 18) : The number of people (age under 18) is 466,183.
- Rank within US : This county is ranked 5 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
Jefferson County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 32.3 percent.
- People (Age Under 18) : The number of people (age under 18) is 10,724.
- Rank within US : This county is ranked 30 of 3143
Cassia County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 30.9 percent.
- People (Age Under 18) : The number of people (age under 18) is 7,879.
- Rank within US : This county is ranked 50 of 3143
Franklin County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 30.5 percent.
- People (Age Under 18) : The number of people (age under 18) is 4,593.
- Rank within US : This county is ranked 60 of 3143
Bonneville 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 38,603.
- Rank within US : This county is ranked 78 of 3143
Power County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 29.8 percent.
- People (Age Under 18) : The number of people (age under 18) is 2,423.
- Rank within US : This county is ranked 78 of 3143
Jerome County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 29.6 percent.
- People (Age Under 18) : The number of people (age under 18) is 7,461.
- Rank within US : This county is ranked 85 of 3143
Bingham County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 29.1 percent.
- People (Age Under 18) : The number of people (age under 18) is 14,456.
- Rank within US : This county is ranked 95 of 3143
Clark County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 28.5 percent.
- People (Age Under 18) : The number of people (age under 18) is 242.
- Rank within US : This county is ranked 114 of 3143
Minidoka County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 28.2 percent.
- People (Age Under 18) : The number of people (age under 18) is 6,265.
- Rank within US : This county is ranked 126 of 3143
Bear Lake County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 27.4 percent.
- People (Age Under 18) : The number of people (age under 18) is 1,820.
- Rank within US : This county is ranked 156 of 3143
Oneida County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 27.0 percent.
- People (Age Under 18) : The number of people (age under 18) is 1,289.
- Rank within US : This county is ranked 175 of 3143
Canyon County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 26.7 percent.
- People (Age Under 18) : The number of people (age under 18) is 67,038.
- Rank within US : This county is ranked 196 of 3143
Camas County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 26.4 percent.
- People (Age Under 18) : The number of people (age under 18) is 297.
- Rank within US : This county is ranked 221 of 3143
Caribou County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 26.4 percent.
- People (Age Under 18) : The number of people (age under 18) is 1,891.
- Rank within US : This county is ranked 221 of 3143
Gooding County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 26.4 percent.
- People (Age Under 18) : The number of people (age under 18) is 4,204.
- Rank within US : This county is ranked 221 of 3143
Twin Falls County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 26.3 percent.
- People (Age Under 18) : The number of people (age under 18) is 24,672.
- Rank within US : This county is ranked 233 of 3143
Lincoln County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 26.0 percent.
- People (Age Under 18) : The number of people (age under 18) is 1,393.
- Rank within US : This county is ranked 255 of 3143
Payette County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 25.5 percent.
- People (Age Under 18) : The number of people (age under 18) is 6,826.
- Rank within US : This county is ranked 321 of 3143
Bannock County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 25.1 percent.
- People (Age Under 18) : The number of people (age under 18) is 22,469.
- Rank within US : This county is ranked 410 of 3143
Butte County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 24.6 percent.
- People (Age Under 18) : The number of people (age under 18) is 660.
- Rank within US : This county is ranked 514 of 3143
Owyhee 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 3,056.
- Rank within US : This county is ranked 573 of 3143
Elmore County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 24.2 percent.
- People (Age Under 18) : The number of people (age under 18) is 7,101.
- Rank within US : This county is ranked 635 of 3143
Fremont County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 24.0 percent.
- People (Age Under 18) : The number of people (age under 18) is 3,340.
- Rank within US : This county is ranked 690 of 3143
Boundary County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 23.3 percent.
- People (Age Under 18) : The number of people (age under 18) is 3,072.
- Rank within US : This county is ranked 926 of 3143
Kootenai County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 22.3 percent.
- People (Age Under 18) : The number of people (age under 18) is 40,656.
- Rank within US : This county is ranked 1356 of 3143
Teton County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 22.3 percent.
- People (Age Under 18) : The number of people (age under 18) is 2,775.
- Rank within US : This county is ranked 1356 of 3143
Washington County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 22.2 percent.
- People (Age Under 18) : The number of people (age under 18) is 2,474.
- Rank within US : This county is ranked 1395 of 3143
Ada 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 114,193.
- Rank within US : This county is ranked 1478 of 3143
Benewah County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 22.0 percent.
- People (Age Under 18) : The number of people (age under 18) is 2,235.
- Rank within US : This county is ranked 1478 of 3143
Gem 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 4,523.
- Rank within US : This county is ranked 1525 of 3143
Lewis 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 808.
- Rank within US : This county is ranked 1525 of 3143
Nez Perce County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 21.2 percent.
- People (Age Under 18) : The number of people (age under 18) is 9,063.
- Rank within US : This county is ranked 1816 of 3143
Shoshone County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 20.7 percent.
- People (Age Under 18) : The number of people (age under 18) is 2,857.
- Rank within US : This county is ranked 2021 of 3143
Madison 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 11,054.
- Rank within US : This county is ranked 2193 of 3143
Idaho County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 19.8 percent.
- People (Age Under 18) : The number of people (age under 18) is 3,456.
- Rank within US : This county is ranked 2323 of 3143
Bonner County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 19.6 percent.
- People (Age Under 18) : The number of people (age under 18) is 9,996.
- Rank within US : This county is ranked 2372 of 3143
Blaine 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 4,781.
- Rank within US : This county is ranked 2493 of 3143
Latah County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 18.9 percent.
- People (Age Under 18) : The number of people (age under 18) is 7,748.
- Rank within US : This county is ranked 2564 of 3143
Valley 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 2,326.
- Rank within US : This county is ranked 2580 of 3143
Adams County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 17.4 percent.
- People (Age Under 18) : The number of people (age under 18) is 827.
- Rank within US : This county is ranked 2833 of 3143
Lemhi 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 1,399.
- Rank within US : This county is ranked 2883 of 3143
Boise County
- 2023 Rural-Urban Continuum Codes Φ : Urban
- Value (Percent) : The value is 15.4 percent.
- People (Age Under 18) : The number of people (age under 18) is 1,274.
- Rank within US : This county is ranked 3017 of 3143
Clearwater County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 14.9 percent.
- People (Age Under 18) : The number of people (age under 18) is 1,341.
- Rank within US : This county is ranked 3044 of 3143
Custer County
- 2023 Rural-Urban Continuum Codes Φ : Rural
- Value (Percent) : The value is 13.9 percent.
- People (Age Under 18) : The number of people (age under 18) is 623.
- Rank within US : This county is ranked 3093 of 3143
Notes:
Created by statecancerprofiles.cancer.gov on 03/28/2026 9:17 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.