State Cancer Profiles

Interpretation of Demographics Data

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

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

Montana

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Value (Percent) : The value is 21.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 234,707.
• Rank within US : This county is ranked 36 of 52

Yellowstone County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 23.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 38,803.
• Rank within US : This county is ranked 1057 of 3143

Flathead County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 23,948.
• Rank within US : This county is ranked 1650 of 3143

Gallatin 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 23,305.
• Rank within US : This county is ranked 2580 of 3143

Missoula County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 18.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 21,937.
• Rank within US : This county is ranked 2692 of 3143

Cascade 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 18,862.
• Rank within US : This county is ranked 1356 of 3143

Lewis and Clark 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 15,566.
• Rank within US : This county is ranked 1816 of 3143

Ravalli County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 8,703.
• Rank within US : This county is ranked 2620 of 3143

Silver Bow 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 7,227.
• Rank within US : This county is ranked 2193 of 3143

Lake 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 7,167.
• Rank within US : This county is ranked 1478 of 3143

Hill 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 4,563.
• Rank within US : This county is ranked 126 of 3143

Glacier County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 30.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 4,134.
• Rank within US : This county is ranked 64 of 3143

Big Horn County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 31.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 4,041.
• Rank within US : This county is ranked 40 of 3143

Lincoln County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.1 percent.
• People (Age Under 18) : The number of people (age under 18) is 3,823.
• Rank within US : This county is ranked 2708 of 3143

Roosevelt County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 32.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 3,465.
• Rank within US : This county is ranked 25 of 3143

Park 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 2,990.
• Rank within US : This county is ranked 2900 of 3143

Richland County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 24.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,802.
• Rank within US : This county is ranked 456 of 3143

Jefferson 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 2,555.
• Rank within US : This county is ranked 2262 of 3143

Fergus 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 2,456.
• Rank within US : This county is ranked 1910 of 3143

Custer 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 2,369.
• Rank within US : This county is ranked 2323 of 3143

Rosebud County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 28.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,308.
• Rank within US : This county is ranked 121 of 3143

Sanders 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 2,265.
• Rank within US : This county is ranked 2883 of 3143

Blaine County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 29.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 2,016.
• Rank within US : This county is ranked 99 of 3143

Stillwater 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 1,925.
• Rank within US : This county is ranked 1910 of 3143

Carbon County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 17.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,907.
• Rank within US : This county is ranked 2858 of 3143

Dawson County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,885.
• Rank within US : This county is ranked 1735 of 3143

Beaverhead 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 1,699.
• Rank within US : This county is ranked 2810 of 3143

Valley 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 1,679.
• Rank within US : This county is ranked 1356 of 3143

Teton County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 25.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,587.
• Rank within US : This county is ranked 435 of 3143

Broadwater 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 1,526.
• Rank within US : This county is ranked 2294 of 3143

Madison County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 16.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,504.
• Rank within US : This county is ranked 2950 of 3143

Pondera County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 23.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,434.
• Rank within US : This county is ranked 748 of 3143

Chouteau 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 1,318.
• Rank within US : This county is ranked 1356 of 3143

Deer Lodge County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 12.0 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,155.
• Rank within US : This county is ranked 3123 of 3143

Toole 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 1,066.
• Rank within US : This county is ranked 1869 of 3143

Mineral County

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Value (Percent) : The value is 20.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 1,028.
• Rank within US : This county is ranked 2021 of 3143

Musselshell County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 19.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 998.
• Rank within US : This county is ranked 2426 of 3143

Phillips County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 23.4 percent.
• People (Age Under 18) : The number of people (age under 18) is 987.
• Rank within US : This county is ranked 889 of 3143

Powell County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 13.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 935.
• Rank within US : This county is ranked 3106 of 3143

Sheridan 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 802.
• Rank within US : This county is ranked 1525 of 3143

Sweet Grass 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 746.
• Rank within US : This county is ranked 2226 of 3143

Fallon County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 23.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 653.
• Rank within US : This county is ranked 778 of 3143

Liberty County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 27.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 531.
• Rank within US : This county is ranked 165 of 3143

Granite County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 14.7 percent.
• People (Age Under 18) : The number of people (age under 18) is 509.
• Rank within US : This county is ranked 3060 of 3143

Judith Basin County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 22.5 percent.
• People (Age Under 18) : The number of people (age under 18) is 466.
• Rank within US : This county is ranked 1260 of 3143

Wheatland County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 21.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 445.
• Rank within US : This county is ranked 1650 of 3143

Powder River 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 364.
• Rank within US : This county is ranked 2226 of 3143

Wibaux 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 356.
• Rank within US : This county is ranked 78 of 3143

McCone County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.6 percent.
• People (Age Under 18) : The number of people (age under 18) is 311.
• Rank within US : This county is ranked 2620 of 3143

Garfield County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 24.9 percent.
• People (Age Under 18) : The number of people (age under 18) is 272.
• Rank within US : This county is ranked 456 of 3143

Daniels 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 267.
• Rank within US : This county is ranked 2742 of 3143

Meagher County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 12.3 percent.
• People (Age Under 18) : The number of people (age under 18) is 246.
• Rank within US : This county is ranked 3117 of 3143

Carter 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 231.
• Rank within US : This county is ranked 2775 of 3143

Prairie 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 212.
• Rank within US : This county is ranked 2883 of 3143

Golden Valley County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 18.2 percent.
• People (Age Under 18) : The number of people (age under 18) is 164.
• Rank within US : This county is ranked 2692 of 3143

Treasure 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 128.
• Rank within US : This county is ranked 2810 of 3143

Petroleum County

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Value (Percent) : The value is 14.8 percent.
• People (Age Under 18) : The number of people (age under 18) is 66.
• Rank within US : This county is ranked 3054 of 3143

Notes:
Created by statecancerprofiles.cancer.gov on 03/30/2026 9:20 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.