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

Counties in Montana by share of population aged 65 and over, 2025

Prairie County had the highest share of population aged 65 and over of 56 counties in 2025, at 38.8%. Gallatin County had the lowest, at 14.9%. The median was 26.1% and the figure for Montana was 22.2%. Source: the U.S. Census Bureau.

Highest38.8Prairie County
Lowest14.9Gallatin County
Median26.156 counties
Montana22.2History

All counties, 2025

CSVChart (SVG)

Prairie CountyPrairie County: 38.8 %38.8Petroleum CountyPetroleum County: 35 %35Sanders CountySanders County: 34.9 %34.9Meagher CountyMeagher County: 32.7 %32.7Judith Basin CountyJudith Basin County: 32.5 %32.5Golden Valley CountyGolden Valley County: 32.5 %32.5Lincoln CountyLincoln County: 32.1 %32.1Powder River CountyPowder River County: 31.7 %31.7Treasure CountyTreasure County: 31.2 %31.2Sweet Grass CountySweet Grass County: 31.1 %31.1Carbon CountyCarbon County: 31 %31Madison CountyMadison County: 30.5 %30.5Granite CountyGranite County: 30.2 %30.2Ravalli CountyRavalli County: 30 %30Deer Lodge CountyDeer Lodge County: 30 %30Mineral CountyMineral County: 29.7 %29.7Daniels CountyDaniels County: 29.3 %29.3Carter CountyCarter County: 29 %29McCone CountyMcCone County: 28.9 %28.9Wheatland CountyWheatland County: 28.5 %28.5Fergus CountyFergus County: 28.2 %28.2Stillwater CountyStillwater County: 28.2 %28.2Lake CountyLake County: 27.3 %27.3Sheridan CountySheridan County: 27.2 %27.2Musselshell CountyMusselshell County: 26.9 %26.9Garfield CountyGarfield County: 26.7 %26.7Jefferson CountyJefferson County: 26.6 %26.6Valley CountyValley County: 26.1 %26.1Phillips CountyPhillips County: 26 %26Park CountyPark County: 25.6 %25.6Beaverhead CountyBeaverhead County: 25.6 %25.6Teton CountyTeton County: 25.5 %25.5Powell CountyPowell County: 25.4 %25.4Chouteau CountyChouteau County: 25.1 %25.1Wibaux CountyWibaux County: 25.1 %25.1Pondera CountyPondera County: 25.1 %25.1Liberty CountyLiberty County: 25 %25Broadwater CountyBroadwater County: 23.4 %23.4Dawson CountyDawson County: 23.2 %23.2Flathead CountyFlathead County: 23.1 %23.1Fallon CountyFallon County: 22.9 %22.9Silver Bow CountySilver Bow County: 22.7 %22.7Custer CountyCuster County: 22.6 %22.6Lewis and Clark CountyLewis and Clark County: 22.2 %22.2Cascade CountyCascade County: 21 %21Yellowstone CountyYellowstone County: 20.2 %20.2Missoula CountyMissoula County: 19.6 %19.6Rosebud CountyRosebud County: 19.1 %19.1Blaine CountyBlaine County: 19.1 %19.1Richland CountyRichland County: 19 %19Hill CountyHill County: 18.8 %18.8Toole CountyToole County: 18.7 %18.7Glacier CountyGlacier County: 15.8 %15.8Roosevelt CountyRoosevelt County: 15.5 %15.5Big Horn CountyBig Horn County: 15.3 %15.3Gallatin CountyGallatin County: 14.9 %14.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2025 (%)Change on 2024
1Prairie County38.8+0.9 pts
2Petroleum County35-0.3 pts
3Sanders County34.9+0.7 pts
4Meagher County32.7+0.9 pts
5Judith Basin County32.5+1 pts
6Golden Valley County32.5-0.5 pts
7Lincoln County32.1+0.5 pts
8Powder River County31.7+0.7 pts
9Treasure County31.2+1 pts
10Sweet Grass County31.1+1.6 pts
11Carbon County31+1.3 pts
12Madison County30.5+0.2 pts
13Granite County30.2+1.2 pts
14Ravalli County30+0.4 pts
15Deer Lodge County30+1.2 pts
16Mineral County29.7+0.8 pts
17Daniels County29.3+0.8 pts
18Carter County29+0.8 pts
19McCone County28.9+0.7 pts
20Wheatland County28.5-0.3 pts
21Fergus County28.2+0.5 pts
22Stillwater County28.2+0.7 pts
23Lake County27.3+0.9 pts
24Sheridan County27.2+0.2 pts
25Musselshell County26.9+0.2 pts
26Garfield County26.7+0.6 pts
27Jefferson County26.6+0.5 pts
28Valley County26.1+0.6 pts
29Phillips County26+0.8 pts
30Park County25.6+0.8 pts
31Beaverhead County25.6+0.2 pts
32Teton County25.5+0.7 pts
33Powell County25.4+0.8 pts
34Chouteau County25.1+0.5 pts
35Wibaux County25.1+0.5 pts
36Pondera County25.1+0.7 pts
37Liberty County25+0.1 pts
38Broadwater County23.4+0.1 pts
39Dawson County23.2+0.4 pts
40Flathead County23.1+0.4 pts
41Fallon County22.9+1.1 pts
42Silver Bow County22.7+0.5 pts
43Custer County22.6+0.6 pts
44Lewis and Clark County22.2+0.6 pts
45Cascade County21+0.3 pts
46Yellowstone County20.2+0.5 pts
47Missoula County19.6+0.4 pts
48Rosebud County19.1+0.3 pts
49Blaine County19.1+0.7 pts
50Richland County190 pts
51Hill County18.8+0.4 pts
52Toole County18.7+0.1 pts
53Glacier County15.8+0.8 pts
54Roosevelt County15.5+0.3 pts
55Big Horn County15.3+0.6 pts
56Gallatin County14.9+0.4 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 38.8% in 2025, according to the U.S. Census Bureau.

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

Gallatin County, with 14.9% in 2025.

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