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 2023, at 36.5%. Gallatin County had the lowest, at 14.3%. The median was 25.3% and the figure for Montana was 21.2%. Source: the U.S. Census Bureau.

Highest36.5Prairie County
Lowest14.3Gallatin County
Median25.356 counties
Montana21.2History

All counties, 2023

CSVChart (SVG)

Prairie CountyPrairie County: 36.5 %36.5Petroleum CountyPetroleum County: 33.9 %33.9Sanders CountySanders County: 33.3 %33.3Golden Valley CountyGolden Valley County: 32.1 %32.1Lincoln CountyLincoln County: 31.2 %31.2Judith Basin CountyJudith Basin County: 30.2 %30.2Madison CountyMadison County: 30.1 %30.1Meagher CountyMeagher County: 30 %30Powder River CountyPowder River County: 29.8 %29.8Granite CountyGranite County: 29.1 %29.1Ravalli CountyRavalli County: 29 %29Sweet Grass CountySweet Grass County: 28.6 %28.6Mineral CountyMineral County: 28.5 %28.5Carbon CountyCarbon County: 28.5 %28.5Treasure CountyTreasure County: 28.4 %28.4Daniels CountyDaniels County: 28.3 %28.3Carter CountyCarter County: 28.2 %28.2Deer Lodge CountyDeer Lodge County: 28.1 %28.1Wheatland CountyWheatland County: 28 %28McCone CountyMcCone County: 27.8 %27.8Fergus CountyFergus County: 27.4 %27.4Stillwater CountyStillwater County: 27.1 %27.1Sheridan CountySheridan County: 26.9 %26.9Musselshell CountyMusselshell County: 26.5 %26.5Lake CountyLake County: 25.8 %25.8Garfield CountyGarfield County: 25.7 %25.7Wibaux CountyWibaux County: 25.5 %25.5Jefferson CountyJefferson County: 25.5 %25.5Beaverhead CountyBeaverhead County: 25.2 %25.2Valley CountyValley County: 24.8 %24.8Liberty CountyLiberty County: 24.6 %24.6Phillips CountyPhillips County: 24.3 %24.3Park CountyPark County: 24.2 %24.2Teton CountyTeton County: 24.2 %24.2Chouteau CountyChouteau County: 24 %24Powell CountyPowell County: 23.7 %23.7Pondera CountyPondera County: 23.2 %23.2Broadwater CountyBroadwater County: 22.9 %22.9Dawson CountyDawson County: 22.3 %22.3Flathead CountyFlathead County: 22.2 %22.2Silver Bow CountySilver Bow County: 21.6 %21.6Custer CountyCuster County: 21.3 %21.3Lewis and Clark CountyLewis and Clark County: 21 %21Fallon CountyFallon County: 20.9 %20.9Cascade CountyCascade County: 20.4 %20.4Yellowstone CountyYellowstone County: 19.2 %19.2Missoula CountyMissoula County: 18.9 %18.9Rosebud CountyRosebud County: 18.7 %18.7Toole CountyToole County: 18.4 %18.4Richland CountyRichland County: 18.2 %18.2Blaine CountyBlaine County: 17.9 %17.9Hill CountyHill County: 17.8 %17.8Roosevelt CountyRoosevelt County: 14.7 %14.7Big Horn CountyBig Horn County: 14.4 %14.4Glacier CountyGlacier County: 14.3 %14.3Gallatin CountyGallatin County: 14.3 %14.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2023 (%)Change on 2022
1Prairie County36.5+2 pts
2Petroleum County33.9+0.7 pts
3Sanders County33.3+0.6 pts
4Golden Valley County32.1+1.2 pts
5Lincoln County31.2+0.6 pts
6Judith Basin County30.2+1.1 pts
7Madison County30.1+0.3 pts
8Meagher County30+1.3 pts
9Powder River County29.80 pts
10Granite County29.10 pts
11Ravalli County29+0.7 pts
12Sweet Grass County28.6+0.1 pts
13Mineral County28.5+0.7 pts
14Carbon County28.5+1.4 pts
15Treasure County28.4+0.4 pts
16Daniels County28.3+0.5 pts
17Carter County28.2+0.1 pts
18Deer Lodge County28.1+0.9 pts
19Wheatland County28+0.9 pts
20McCone County27.8+1.3 pts
21Fergus County27.4+0.3 pts
22Stillwater County27.1+0.9 pts
23Sheridan County26.9+0.3 pts
24Musselshell County26.5+0.3 pts
25Lake County25.8+0.4 pts
26Garfield County25.7+0.1 pts
27Wibaux County25.5-0.6 pts
28Jefferson County25.5+0.6 pts
29Beaverhead County25.2+0.3 pts
30Valley County24.8+0.7 pts
31Liberty County24.6+0.4 pts
32Phillips County24.3-0 pts
33Park County24.2+0.3 pts
34Teton County24.2-0.1 pts
35Chouteau County24+0.8 pts
36Powell County23.7+0.4 pts
37Pondera County23.2+0.2 pts
38Broadwater County22.9+0.3 pts
39Dawson County22.3+0.5 pts
40Flathead County22.2+0.3 pts
41Silver Bow County21.6+0.4 pts
42Custer County21.3+0.5 pts
43Lewis and Clark County21+0.4 pts
44Fallon County20.9+1.3 pts
45Cascade County20.4+0.4 pts
46Yellowstone County19.2+0.6 pts
47Missoula County18.9+0.5 pts
48Rosebud County18.7+0.7 pts
49Toole County18.4+0.1 pts
50Richland County18.2+0.9 pts
51Blaine County17.9+1 pts
52Hill County17.8+0.6 pts
53Roosevelt County14.7+0.5 pts
54Big Horn County14.4+0.7 pts
55Glacier County14.3+0.6 pts
56Gallatin County14.3+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 36.5% in 2023, according to the U.S. Census Bureau.

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

Gallatin County, with 14.3% in 2023.

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