Data / Rankings / Population aged 65 and over / Counties in Montana

Counties in Montana by share of population aged 65 and over

Prairie County had the highest share of population aged 65 and over of 56 counties in 2024, at 37.9%. Gallatin County had the lowest, at 14.6%. The median was 25.5% and the figure for Montana was 21.7%. Source: the U.S. Census Bureau.

Highest37.9Prairie County
Lowest14.6Gallatin County
Median25.556 counties
Montana21.7History

All counties, 2024

CSVChart (SVG)

Prairie CountyPrairie County: 37.9 %37.9Petroleum CountyPetroleum County: 35.3 %35.3Sanders CountySanders County: 34.1 %34.1Golden Valley CountyGolden Valley County: 32.9 %32.9Meagher CountyMeagher County: 31.8 %31.8Lincoln CountyLincoln County: 31.5 %31.5Judith Basin CountyJudith Basin County: 31.4 %31.4Powder River CountyPowder River County: 30.9 %30.9Madison CountyMadison County: 30.3 %30.3Treasure CountyTreasure County: 30.2 %30.2Carbon CountyCarbon County: 29.7 %29.7Ravalli CountyRavalli County: 29.6 %29.6Sweet Grass CountySweet Grass County: 29.5 %29.5Granite CountyGranite County: 29.1 %29.1Mineral CountyMineral County: 28.9 %28.9Wheatland CountyWheatland County: 28.9 %28.9Deer Lodge CountyDeer Lodge County: 28.8 %28.8Daniels CountyDaniels County: 28.5 %28.5McCone CountyMcCone County: 28.2 %28.2Carter CountyCarter County: 28.2 %28.2Fergus CountyFergus County: 27.7 %27.7Stillwater CountyStillwater County: 27.5 %27.5Sheridan CountySheridan County: 27 %27Musselshell CountyMusselshell County: 26.8 %26.8Lake CountyLake County: 26.5 %26.5Garfield CountyGarfield County: 26.1 %26.1Jefferson CountyJefferson County: 26.1 %26.1Valley CountyValley County: 25.5 %25.5Beaverhead CountyBeaverhead County: 25.4 %25.4Phillips CountyPhillips County: 25.2 %25.2Liberty CountyLiberty County: 25 %25Teton CountyTeton County: 24.8 %24.8Park CountyPark County: 24.8 %24.8Chouteau CountyChouteau County: 24.6 %24.6Powell CountyPowell County: 24.6 %24.6Wibaux CountyWibaux County: 24.6 %24.6Pondera CountyPondera County: 24.3 %24.3Broadwater CountyBroadwater County: 23.2 %23.2Dawson CountyDawson County: 22.8 %22.8Flathead CountyFlathead County: 22.7 %22.7Silver Bow CountySilver Bow County: 22.3 %22.3Custer CountyCuster County: 22.1 %22.1Fallon CountyFallon County: 21.9 %21.9Lewis and Clark CountyLewis and Clark County: 21.6 %21.6Cascade CountyCascade County: 20.8 %20.8Yellowstone CountyYellowstone County: 19.7 %19.7Missoula CountyMissoula County: 19.2 %19.2Richland CountyRichland County: 19 %19Rosebud CountyRosebud County: 18.8 %18.8Toole CountyToole County: 18.6 %18.6Blaine CountyBlaine County: 18.4 %18.4Hill CountyHill County: 18.4 %18.4Roosevelt CountyRoosevelt County: 15.1 %15.1Glacier CountyGlacier County: 15 %15Big Horn CountyBig Horn County: 14.7 %14.7Gallatin CountyGallatin County: 14.6 %14.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2024 (%)Change on 2023
1Prairie County37.9+1.4 pts
2Petroleum County35.3+1.4 pts
3Sanders County34.1+0.9 pts
4Golden Valley County32.9+0.9 pts
5Meagher County31.8+1.8 pts
6Lincoln County31.5+0.4 pts
7Judith Basin County31.4+1.2 pts
8Powder River County30.9+1.2 pts
9Madison County30.3+0.2 pts
10Treasure County30.2+1.8 pts
11Carbon County29.7+1.2 pts
12Ravalli County29.6+0.7 pts
13Sweet Grass County29.5+1 pts
14Granite County29.1-0 pts
15Mineral County28.9+0.4 pts
16Wheatland County28.9+0.9 pts
17Deer Lodge County28.8+0.7 pts
18Daniels County28.5+0.2 pts
19McCone County28.2+0.4 pts
20Carter County28.2-0 pts
21Fergus County27.7+0.4 pts
22Stillwater County27.5+0.4 pts
23Sheridan County27+0.1 pts
24Musselshell County26.8+0.3 pts
25Lake County26.5+0.7 pts
26Garfield County26.1+0.4 pts
27Jefferson County26.1+0.6 pts
28Valley County25.5+0.7 pts
29Beaverhead County25.4+0.3 pts
30Phillips County25.2+0.9 pts
31Liberty County25+0.4 pts
32Teton County24.8+0.6 pts
33Park County24.8+0.5 pts
34Chouteau County24.6+0.6 pts
35Powell County24.6+0.9 pts
35Wibaux County24.6-1 pts
37Pondera County24.3+1.1 pts
38Broadwater County23.2+0.3 pts
39Dawson County22.8+0.5 pts
40Flathead County22.7+0.5 pts
41Silver Bow County22.3+0.7 pts
42Custer County22.1+0.8 pts
43Fallon County21.9+1 pts
44Lewis and Clark County21.6+0.6 pts
45Cascade County20.8+0.3 pts
46Yellowstone County19.7+0.5 pts
47Missoula County19.2+0.4 pts
48Richland County19+0.7 pts
49Rosebud County18.8+0.1 pts
50Toole County18.6+0.2 pts
51Blaine County18.4+0.6 pts
52Hill County18.4+0.5 pts
53Roosevelt County15.1+0.4 pts
54Glacier County15+0.7 pts
55Big Horn County14.7+0.3 pts
56Gallatin County14.6+0.3 pts

Other periods

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Montana by share of population aged 65 and over using official data, and cite the source.
rank_places {"indicator":"population_65_plus_share","level":"province","within":"Montana","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=Montana&limit=10

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Questions

Which county has the highest share of population aged 65 and over?

Prairie County, with 37.9% in 2024, according to the U.S. Census Bureau.

Which county has the lowest share of population aged 65 and over?

Gallatin County, with 14.6% in 2024.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. Retrieved 2026-10-09.

Population aged 65 and over: other rankings

Counties in Montana: more rankings