Data / Rankings / Uninsured rate, ages 35 to 64 (US, ACS) / Counties in Montana

Counties in Montana by uninsured rate, ages 35 to 64 (US, ACS), 2024

Roosevelt County had the highest uninsured rate, ages 35 to 64 (US, ACS) of 56 counties in 2024, at 31.2%. Powell County had the lowest, at 2.2%. The median was 10% and the figure for Montana was 10.9%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest31.2Roosevelt County
Lowest2.2Powell County
Median1056 counties
Montana10.9History

Map of counties, 2024

Beaverhead County: 7.7 %Big Horn County: 28.9 %Blaine County: 23.1 %Broadwater County: 13.3 %Carbon County: 12.6 %Carter County: 14.4 %Cascade County: 8.5 %Chouteau County: 8.2 %Custer County: 7.7 %Daniels County: 3.9 %Dawson County: 12.5 %Deer Lodge County: 6.4 %Fallon County: 5.2 %Fergus County: 20.3 %Flathead County: 12.9 %Gallatin County: 8.9 %Garfield County: 10.1 %Glacier County: 27.6 %Golden Valley County: 25.3 %Granite County: 13 %Hill County: 13.2 %Jefferson County: 7.7 %Judith Basin County: 8 %Lake County: 18 %Lewis and Clark County: 7 %Liberty County: 6.4 %Lincoln County: 20.9 %McCone County: 9.2 %Madison County: 11.6 %Meagher County: 7.9 %Mineral County: 14.8 %Missoula County: 8.3 %Musselshell County: 7.5 %Park County: 9.9 %Petroleum County: 12.6 %Phillips County: 13.8 %Pondera County: 11.9 %Powder River County: 8.7 %Powell County: 2.2 %Prairie County: 8.9 %Ravalli County: 14 %Richland County: 5.5 %Roosevelt County: 31.2 %Rosebud County: 14.1 %Sanders County: 18.3 %Sheridan County: 7.6 %Silver Bow County: 10.1 %Stillwater County: 5.6 %Sweet Grass County: 12.4 %Teton County: 7.8 %Toole County: 9.3 %Treasure County: 6.8 %Valley County: 9.2 %Wheatland County: 23.2 %Wibaux County: 14.4 %Yellowstone County: 8.7 %
  • Under 7.5
  • 7.5 to 8.3
  • 8.3 to 10
  • 10 to 13
  • 13 to 17
  • 17 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2024

Roosevelt County: 31.2 %Roosevelt County31.2Big Horn County: 28.9 %Big Horn County28.9Glacier County: 27.6 %Glacier County27.6Golden Valley County: 25.3 %Golden Valley County25.3Wheatland County: 23.2 %Wheatland County23.2Blaine County: 23.1 %Blaine County23.1Lincoln County: 20.9 %Lincoln County20.9Fergus County: 20.3 %Fergus County20.3Sanders County: 18.3 %Sanders County18.3Lake County: 18 %Lake County18Mineral County: 14.8 %Mineral County14.8Wibaux County: 14.4 %Wibaux County14.4Carter County: 14.4 %Carter County14.4Rosebud County: 14.1 %Rosebud County14.1Ravalli County: 14 %Ravalli County14Phillips County: 13.8 %Phillips County13.8Broadwater County: 13.3 %Broadwater County13.3Hill County: 13.2 %Hill County13.2Granite County: 13 %Granite County13Flathead County: 12.9 %Flathead County12.9Carbon County: 12.6 %Carbon County12.6Petroleum County: 12.6 %Petroleum County12.6Dawson County: 12.5 %Dawson County12.5Sweet Grass County: 12.4 %Sweet Grass County12.4Pondera County: 11.9 %Pondera County11.9Madison County: 11.6 %Madison County11.6Silver Bow County: 10.1 %Silver Bow County10.1Garfield County: 10.1 %Garfield County10.1Park County: 9.9 %Park County9.9Toole County: 9.3 %Toole County9.3McCone County: 9.2 %McCone County9.2Valley County: 9.2 %Valley County9.2Gallatin County: 8.9 %Gallatin County8.9Prairie County: 8.9 %Prairie County8.9Powder River County: 8.7 %Powder River County8.7Yellowstone County: 8.7 %Yellowstone County8.7Cascade County: 8.5 %Cascade County8.5Missoula County: 8.3 %Missoula County8.3Chouteau County: 8.2 %Chouteau County8.2Judith Basin County: 8 %Judith Basin County8Meagher County: 7.9 %Meagher County7.9Teton County: 7.8 %Teton County7.8Beaverhead County: 7.7 %Beaverhead County7.7Jefferson County: 7.7 %Jefferson County7.7Custer County: 7.7 %Custer County7.7Sheridan County: 7.6 %Sheridan County7.6Musselshell County: 7.5 %Musselshell County7.5Lewis and Clark County: 7 %Lewis and Clark County7Treasure County: 6.8 %Treasure County6.8Liberty County: 6.4 %Liberty County6.4Deer Lodge County: 6.4 %Deer Lodge County6.4Stillwater County: 5.6 %Stillwater County5.6Richland County: 5.5 %Richland County5.5Fallon County: 5.2 %Fallon County5.2Daniels County: 3.9 %Daniels County3.9Powell County: 2.2 %Powell County2.2Roosevelt County: 31.2 %Roosevelt County31.2Big Horn County: 28.9 %Big Horn County28.9Glacier County: 27.6 %Glacier County27.6Golden Valley County: 25.3 %Golden Valley County25.3Wheatland County: 23.2 %Wheatland County23.2Blaine County: 23.1 %Blaine County23.1Lincoln County: 20.9 %Lincoln County20.9Fergus County: 20.3 %Fergus County20.3Sanders County: 18.3 %Sanders County18.3Lake County: 18 %Lake County18Mineral County: 14.8 %Mineral County14.8Wibaux County: 14.4 %Wibaux County14.4Carter County: 14.4 %Carter County14.4Rosebud County: 14.1 %Rosebud County14.1Ravalli County: 14 %Ravalli County14Phillips County: 13.8 %Phillips County13.8Broadwater County: 13.3 %Broadwater County13.3Hill County: 13.2 %Hill County13.2Granite County: 13 %Granite County13Flathead County: 12.9 %Flathead County12.9Carbon County: 12.6 %Carbon County12.6Petroleum County: 12.6 %Petroleum County12.6Dawson County: 12.5 %Dawson County12.5Sweet Grass County: 12.4 %Sweet Grass County12.4Pondera County: 11.9 %Pondera County11.9Madison County: 11.6 %Madison County11.6Silver Bow County: 10.1 %Silver Bow County10.1Garfield County: 10.1 %Garfield County10.1Park County: 9.9 %Park County9.9Toole County: 9.3 %Toole County9.3McCone County: 9.2 %McCone County9.2Valley County: 9.2 %Valley County9.2Gallatin County: 8.9 %Gallatin County8.9Prairie County: 8.9 %Prairie County8.9Powder River County: 8.7 %Powder River County8.7Yellowstone County: 8.7 %Yellowstone County8.7Cascade County: 8.5 %Cascade County8.5Missoula County: 8.3 %Missoula County8.3Chouteau County: 8.2 %Chouteau County8.2Judith Basin County: 8 %Judith Basin County8Meagher County: 7.9 %Meagher County7.9Teton County: 7.8 %Teton County7.8Beaverhead County: 7.7 %Beaverhead County7.7Jefferson County: 7.7 %Jefferson County7.7Custer County: 7.7 %Custer County7.7Sheridan County: 7.6 %Sheridan County7.6Musselshell County: 7.5 %Musselshell County7.5Lewis and Clark County: 7 %Lewis and Clark County7Treasure County: 6.8 %Treasure County6.8Liberty County: 6.4 %Liberty County6.4Deer Lodge County: 6.4 %Deer Lodge County6.4Stillwater County: 5.6 %Stillwater County5.6Richland County: 5.5 %Richland County5.5Fallon County: 5.2 %Fallon County5.2Daniels County: 3.9 %Daniels County3.9Powell County: 2.2 %Powell County2.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Roosevelt County31.2-0.9 pts
2Big Horn County28.9+4.5 pts
3Glacier County27.6-5.6 pts
4Golden Valley County25.3+5 pts
5Wheatland County23.2-0.6 pts
6Blaine County23.1+0.2 pts
7Lincoln County20.9+0.2 pts
8Fergus County20.3+2.6 pts
9Sanders County18.3+1.5 pts
10Lake County18+0.9 pts
11Mineral County14.8+0.5 pts
12Wibaux County14.4+1.7 pts
13Carter County14.40 pts
14Rosebud County14.1-0.6 pts
15Ravalli County14+1.8 pts
16Phillips County13.8+0.4 pts
17Broadwater County13.3+2.3 pts
18Hill County13.2-0.7 pts
19Granite County13+2.6 pts
20Flathead County12.9-0.1 pts
21Carbon County12.6+2 pts
22Petroleum County12.6+2.8 pts
23Dawson County12.5+2.6 pts
24Sweet Grass County12.4-0.6 pts
25Pondera County11.9+1.6 pts
26Madison County11.6-0.9 pts
27Silver Bow County10.1-0.5 pts
28Garfield County10.1-2.5 pts
29Park County9.9+0.1 pts
30Toole County9.3+1.2 pts
31McCone County9.2-3.3 pts
32Valley County9.2-0.5 pts
33Gallatin County8.9-0.9 pts
34Prairie County8.9-3.3 pts
35Powder River County8.7+1 pts
35Yellowstone County8.7+0.3 pts
37Cascade County8.5+0.7 pts
38Missoula County8.3-0.5 pts
39Chouteau County8.2+1.6 pts
40Judith Basin County8-3.6 pts
41Meagher County7.9+2.9 pts
42Teton County7.8-0.5 pts
43Beaverhead County7.7-0.5 pts
44Jefferson County7.7+0.6 pts
45Custer County7.7-0.7 pts
46Sheridan County7.6-1.2 pts
47Musselshell County7.5-0 pts
48Lewis and Clark County7-0.6 pts
49Treasure County6.8-3.1 pts
50Liberty County6.4-2.8 pts
51Deer Lodge County6.4-0.8 pts
52Stillwater County5.6-0.9 pts
53Richland County5.5-2.5 pts
54Fallon County5.2-2.2 pts
55Daniels County3.9+0.3 pts
56Powell County2.2-1.6 pts

Other periods

About this ranking

People aged 35 to 64 without health insurance coverage of any kind, as a percentage of the civilian noninstitutionalized population aged 35 to 64. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Coverage is what people reported at the interview, so the five-year figure averages five years of answers. People whose only coverage is the Indian Health Service count as uninsured. Active-duty military and people living in institutions are outside the universe. For single-year model-based county figures under 65, see uninsured_rate_under_65, uninsured_rate_18_64 and uninsured_rate_under_19 (SAHIE), a different source.

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. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs (Counties in Montana by uninsured rate, ages 35 to 64 (US, ACS), 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat

MLA 9

American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs, Counties in Montana by uninsured rate, ages 35 to 64 (US, ACS), 2024. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. Counties in Montana by uninsured rate, ages 35 to 64 (US, ACS), 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs, Counties in Montana by uninsured rate, ages 35 to 64 (US, ACS), 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_montana_by_2024,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs: Counties in Montana by uninsured rate, ages 35 to 64 (US, ACS), 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs: Counties in Montana by uninsured rate, ages 35 to 64 (US, ACS), 2024
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat
L2  - https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest uninsured rate, ages 35 to 64 (US, ACS)?

Roosevelt County, with 31.2% in 2024, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 35 to 64 (US, ACS)?

Powell County, with 2.2% 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, American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. Retrieved 2026-10-12.

Uninsured rate, ages 35 to 64 (US, ACS): other rankings

Counties in Montana: more rankings