Demographics Table
Demographic Data Report for Montana by County
Population: Age under 18
All Races (includes Hispanic), Both Sexes
2020-2024 American Community Survey 5-Year Data
Sorted by Percent
County
|
2023 Rural-Urban Continuum Codes Φ
|
Value (Percent)
|
People (Age Under 18)
|
Rank within US (of 3143 counties)
|
|---|---|---|---|---|
| Montana | N/A | 21.0 | 234,707 | 36 of 52 |
| United States | N/A | 22.0 | 73,517,834 | N/A |
| Petroleum County | Rural | 14.8 | 66 | 3,054 |
| Treasure County | Rural | 17.5 | 128 | 2,810 |
| Golden Valley County | Rural | 18.2 | 164 | 2,692 |
| Prairie County | Rural | 17.0 | 212 | 2,883 |
| Carter County | Rural | 17.7 | 231 | 2,775 |
| Meagher County | Rural | 12.3 | 246 | 3,117 |
| Daniels County | Rural | 17.9 | 267 | 2,742 |
| Garfield County | Rural | 24.9 | 272 | 456 |
| McCone County | Rural | 18.6 | 311 | 2,620 |
| Wibaux County | Rural | 29.8 | 356 | 78 |
| Powder River County | Rural | 20.1 | 364 | 2,226 |
| Wheatland County | Rural | 21.6 | 445 | 1,650 |
| Judith Basin County | Rural | 22.5 | 466 | 1,260 |
| Granite County | Rural | 14.7 | 509 | 3,060 |
| Liberty County | Rural | 27.2 | 531 | 165 |
| Fallon County | Rural | 23.7 | 653 | 778 |
| Sweet Grass County | Rural | 20.1 | 746 | 2,226 |
| Sheridan County | Rural | 21.9 | 802 | 1,525 |
| Powell County | Rural | 13.3 | 935 | 3,106 |
| Phillips County | Rural | 23.4 | 987 | 889 |
| Musselshell County | Rural | 19.4 | 998 | 2,426 |
| Mineral County | Urban | 20.7 | 1,028 | 2,021 |
| Toole County | Rural | 21.1 | 1,066 | 1,869 |
| Deer Lodge County | Rural | 12.0 | 1,155 | 3,123 |
| Chouteau County | Rural | 22.3 | 1,318 | 1,356 |
| Pondera County | Rural | 23.8 | 1,434 | 748 |
| Madison County | Rural | 16.3 | 1,504 | 2,950 |
| Broadwater County | Urban | 19.9 | 1,526 | 2,294 |
| Teton County | Rural | 25.0 | 1,587 | 435 |
| Valley County | Rural | 22.3 | 1,679 | 1,356 |
| Beaverhead County | Rural | 17.5 | 1,699 | 2,810 |
| Dawson County | Rural | 21.4 | 1,885 | 1,735 |
| Carbon County | Urban | 17.2 | 1,907 | 2,858 |
| Stillwater County | Urban | 21.0 | 1,925 | 1,910 |
| Blaine County | Rural | 29.0 | 2,016 | 99 |
| Sanders County | Rural | 17.0 | 2,265 | 2,883 |
| Rosebud County | Rural | 28.3 | 2,308 | 121 |
| Custer County | Rural | 19.8 | 2,369 | 2,323 |
| Fergus County | Rural | 21.0 | 2,456 | 1,910 |
| Jefferson County | Urban | 20.0 | 2,555 | 2,262 |
| Richland County | Rural | 24.9 | 2,802 | 456 |
| Park County | Rural | 16.9 | 2,990 | 2,900 |
| Roosevelt County | Rural | 32.9 | 3,465 | 25 |
| Lincoln County | Rural | 18.1 | 3,823 | 2,708 |
| Big Horn County | Rural | 31.3 | 4,041 | 40 |
| Glacier County | Rural | 30.3 | 4,134 | 64 |
| Hill County | Rural | 28.2 | 4,563 | 126 |
| Lake County | Rural | 22.0 | 7,167 | 1,478 |
| Silver Bow County | Rural | 20.2 | 7,227 | 2,193 |
| Ravalli County | Rural | 18.6 | 8,703 | 2,620 |
| Lewis and Clark County | Urban | 21.2 | 15,566 | 1,816 |
| Cascade County | Urban | 22.3 | 18,862 | 1,356 |
| Missoula County | Urban | 18.2 | 21,937 | 2,692 |
| Gallatin County | Urban | 18.8 | 23,305 | 2,580 |
| Flathead County | Rural | 21.6 | 23,948 | 1,650 |
| Yellowstone County | Urban | 23.0 | 38,803 | 1,057 |
Notes:
Created by statecancerprofiles.cancer.gov on 03/22/2026 8:32 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 under 18, see the dictionary.
Data for United States does not include Puerto Rico.