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)

Glacier County had the highest uninsured rate, ages 35 to 64 (US, ACS) of 56 counties in 2021, at 44.5%. Powell County had the lowest, at 4.1%. The median was 10.9% and the figure for Montana was 11%. Source: the U.S. Census Bureau.

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Highest44.5Glacier County
Lowest4.1Powell County
Median10.956 counties
Montana11History

Map of counties, 2021

Beaverhead County: 6.1 %Big Horn County: 30.3 %Blaine County: 23.3 %Broadwater County: 15.6 %Carbon County: 10.7 %Carter County: 21 %Cascade County: 9.2 %Chouteau County: 6.4 %Custer County: 7.3 %Daniels County: 7.4 %Dawson County: 5.6 %Deer Lodge County: 10.5 %Fallon County: 6 %Fergus County: 15.5 %Flathead County: 12.9 %Gallatin County: 9.8 %Garfield County: 16.8 %Glacier County: 44.5 %Golden Valley County: 15.5 %Granite County: 12.7 %Hill County: 7.8 %Jefferson County: 8.9 %Judith Basin County: 10.8 %Lake County: 18.1 %Lewis and Clark County: 7.1 %Liberty County: 14.6 %Lincoln County: 15.6 %McCone County: 12.3 %Madison County: 13.6 %Meagher County: 9.5 %Mineral County: 12.1 %Missoula County: 8.3 %Musselshell County: 5.8 %Park County: 14.6 %Petroleum County: 5.7 %Phillips County: 15.4 %Pondera County: 7.7 %Powder River County: 13.8 %Powell County: 4.1 %Prairie County: 11.3 %Ravalli County: 13.8 %Richland County: 10.5 %Roosevelt County: 28.6 %Rosebud County: 16.8 %Sanders County: 13.1 %Sheridan County: 8.2 %Silver Bow County: 7.5 %Stillwater County: 6.8 %Sweet Grass County: 8.5 %Teton County: 13.1 %Toole County: 11 %Treasure County: 7.7 %Valley County: 14.1 %Wheatland County: 25.4 %Wibaux County: 7 %Yellowstone County: 7.6 %
  • Under 7.1
  • 7.1 to 8.3
  • 8.3 to 11
  • 11 to 14
  • 14 to 16
  • 16 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Glacier County: 44.5 %Glacier County44.5Big Horn County: 30.3 %Big Horn County30.3Roosevelt County: 28.6 %Roosevelt County28.6Wheatland County: 25.4 %Wheatland County25.4Blaine County: 23.3 %Blaine County23.3Carter County: 21 %Carter County21Lake County: 18.1 %Lake County18.1Rosebud County: 16.8 %Rosebud County16.8Garfield County: 16.8 %Garfield County16.8Lincoln County: 15.6 %Lincoln County15.6Broadwater County: 15.6 %Broadwater County15.6Fergus County: 15.5 %Fergus County15.5Golden Valley County: 15.5 %Golden Valley County15.5Phillips County: 15.4 %Phillips County15.4Liberty County: 14.6 %Liberty County14.6Park County: 14.6 %Park County14.6Valley County: 14.1 %Valley County14.1Powder River County: 13.8 %Powder River County13.8Ravalli County: 13.8 %Ravalli County13.8Madison County: 13.6 %Madison County13.6Teton County: 13.1 %Teton County13.1Sanders County: 13.1 %Sanders County13.1Flathead County: 12.9 %Flathead County12.9Granite County: 12.7 %Granite County12.7McCone County: 12.3 %McCone County12.3Mineral County: 12.1 %Mineral County12.1Prairie County: 11.3 %Prairie County11.3Toole County: 11 %Toole County11Judith Basin County: 10.8 %Judith Basin County10.8Carbon County: 10.7 %Carbon County10.7Richland County: 10.5 %Richland County10.5Deer Lodge County: 10.5 %Deer Lodge County10.5Gallatin County: 9.8 %Gallatin County9.8Meagher County: 9.5 %Meagher County9.5Cascade County: 9.2 %Cascade County9.2Jefferson County: 8.9 %Jefferson County8.9Sweet Grass County: 8.5 %Sweet Grass County8.5Missoula County: 8.3 %Missoula County8.3Sheridan County: 8.2 %Sheridan County8.2Hill County: 7.8 %Hill County7.8Pondera County: 7.7 %Pondera County7.7Treasure County: 7.7 %Treasure County7.7Yellowstone County: 7.6 %Yellowstone County7.6Silver Bow County: 7.5 %Silver Bow County7.5Daniels County: 7.4 %Daniels County7.4Custer County: 7.3 %Custer County7.3Lewis and Clark County: 7.1 %Lewis and Clark County7.1Wibaux County: 7 %Wibaux County7Stillwater County: 6.8 %Stillwater County6.8Chouteau County: 6.4 %Chouteau County6.4Beaverhead County: 6.1 %Beaverhead County6.1Fallon County: 6 %Fallon County6Musselshell County: 5.8 %Musselshell County5.8Petroleum County: 5.7 %Petroleum County5.7Dawson County: 5.6 %Dawson County5.6Powell County: 4.1 %Powell County4.1Glacier County: 44.5 %Glacier County44.5Big Horn County: 30.3 %Big Horn County30.3Roosevelt County: 28.6 %Roosevelt County28.6Wheatland County: 25.4 %Wheatland County25.4Blaine County: 23.3 %Blaine County23.3Carter County: 21 %Carter County21Lake County: 18.1 %Lake County18.1Rosebud County: 16.8 %Rosebud County16.8Garfield County: 16.8 %Garfield County16.8Lincoln County: 15.6 %Lincoln County15.6Broadwater County: 15.6 %Broadwater County15.6Fergus County: 15.5 %Fergus County15.5Golden Valley County: 15.5 %Golden Valley County15.5Phillips County: 15.4 %Phillips County15.4Liberty County: 14.6 %Liberty County14.6Park County: 14.6 %Park County14.6Valley County: 14.1 %Valley County14.1Powder River County: 13.8 %Powder River County13.8Ravalli County: 13.8 %Ravalli County13.8Madison County: 13.6 %Madison County13.6Teton County: 13.1 %Teton County13.1Sanders County: 13.1 %Sanders County13.1Flathead County: 12.9 %Flathead County12.9Granite County: 12.7 %Granite County12.7McCone County: 12.3 %McCone County12.3Mineral County: 12.1 %Mineral County12.1Prairie County: 11.3 %Prairie County11.3Toole County: 11 %Toole County11Judith Basin County: 10.8 %Judith Basin County10.8Carbon County: 10.7 %Carbon County10.7Richland County: 10.5 %Richland County10.5Deer Lodge County: 10.5 %Deer Lodge County10.5Gallatin County: 9.8 %Gallatin County9.8Meagher County: 9.5 %Meagher County9.5Cascade County: 9.2 %Cascade County9.2Jefferson County: 8.9 %Jefferson County8.9Sweet Grass County: 8.5 %Sweet Grass County8.5Missoula County: 8.3 %Missoula County8.3Sheridan County: 8.2 %Sheridan County8.2Hill County: 7.8 %Hill County7.8Pondera County: 7.7 %Pondera County7.7Treasure County: 7.7 %Treasure County7.7Yellowstone County: 7.6 %Yellowstone County7.6Silver Bow County: 7.5 %Silver Bow County7.5Daniels County: 7.4 %Daniels County7.4Custer County: 7.3 %Custer County7.3Lewis and Clark County: 7.1 %Lewis and Clark County7.1Wibaux County: 7 %Wibaux County7Stillwater County: 6.8 %Stillwater County6.8Chouteau County: 6.4 %Chouteau County6.4Beaverhead County: 6.1 %Beaverhead County6.1Fallon County: 6 %Fallon County6Musselshell County: 5.8 %Musselshell County5.8Petroleum County: 5.7 %Petroleum County5.7Dawson County: 5.6 %Dawson County5.6Powell County: 4.1 %Powell County4.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Glacier County44.5
2Big Horn County30.3
3Roosevelt County28.6
4Wheatland County25.4
5Blaine County23.3
6Carter County21
7Lake County18.1
8Rosebud County16.8
9Garfield County16.8
10Lincoln County15.6
11Broadwater County15.6
12Fergus County15.5
13Golden Valley County15.5
14Phillips County15.4
15Liberty County14.6
15Park County14.6
17Valley County14.1
18Powder River County13.8
19Ravalli County13.8
20Madison County13.6
21Teton County13.1
22Sanders County13.1
23Flathead County12.9
24Granite County12.7
25McCone County12.3
26Mineral County12.1
27Prairie County11.3
28Toole County11
29Judith Basin County10.8
30Carbon County10.7
31Richland County10.5
32Deer Lodge County10.5
33Gallatin County9.8
34Meagher County9.5
35Cascade County9.2
36Jefferson County8.9
37Sweet Grass County8.5
38Missoula County8.3
39Sheridan County8.2
40Hill County7.8
41Pondera County7.7
42Treasure County7.7
43Yellowstone County7.6
44Silver Bow County7.5
45Daniels County7.4
46Custer County7.3
47Lewis and Clark County7.1
48Wibaux County7
49Stillwater County6.8
50Chouteau County6.4
51Beaverhead County6.1
52Fallon County6
53Musselshell County5.8
54Petroleum County5.7
55Dawson County5.6
56Powell County4.1

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/2021/table-based-SF/data/5YRData/acsdt5y2021-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), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-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), 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties?period=2021. 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), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties?period=2021.

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), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_montana_by_2021,
  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), 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties?period=2021. 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/2021/table-based-SF/data/5YRData/acsdt5y2021-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), 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat
L2  - https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/montana-counties?period=2021.
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/2021/table-based-SF/data/5YRData/acsdt5y2021-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)?

Glacier County, with 44.5% in 2021, according to the U.S. Census Bureau.

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

Powell County, with 4.1% in 2021.

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