Data / Rankings / Uninsured rate, under 19 (US model-based estimate) / Counties in Montana

Counties in Montana by uninsured rate, under 19 (US model-based estimate)

Garfield County had the highest uninsured rate, under 19 (US model-based estimate) of 56 counties in 2018, at 20.9%. Yellowstone County had the lowest, at 4.3%. The median was 8.2% and the figure for Montana was 6.2%. Source: the U.S. Census Bureau.

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Highest20.9Garfield County
Lowest4.3Yellowstone County
Median8.256 counties
Montana6.2History

Map of counties, 2018

Beaverhead County: 8.2 %Big Horn County: 7.7 %Blaine County: 9.4 %Broadwater County: 7.7 %Carbon County: 9.4 %Carter County: 13.2 %Cascade County: 5.4 %Chouteau County: 11.2 %Custer County: 6.3 %Daniels County: 9 %Dawson County: 5.4 %Deer Lodge County: 5.9 %Fallon County: 8 %Fergus County: 10.2 %Flathead County: 5.3 %Gallatin County: 5.1 %Garfield County: 20.9 %Glacier County: 8 %Golden Valley County: 10.6 %Granite County: 10.8 %Hill County: 6.9 %Jefferson County: 6.1 %Judith Basin County: 8.1 %Lake County: 8.6 %Lewis and Clark County: 5.1 %Liberty County: 11.3 %Lincoln County: 7.4 %McCone County: 16.2 %Madison County: 9.4 %Meagher County: 8.2 %Mineral County: 6.8 %Missoula County: 4.5 %Musselshell County: 7.5 %Park County: 6.7 %Petroleum County: 10.5 %Phillips County: 9.9 %Pondera County: 7 %Powder River County: 10.7 %Powell County: 7.2 %Prairie County: 9.4 %Ravalli County: 8.9 %Richland County: 8.2 %Roosevelt County: 11.7 %Rosebud County: 8.8 %Sanders County: 11.1 %Sheridan County: 9.7 %Silver Bow County: 5.2 %Stillwater County: 6.3 %Sweet Grass County: 8.9 %Teton County: 11 %Toole County: 8.2 %Treasure County: 8.6 %Valley County: 6.2 %Wheatland County: 12.5 %Wibaux County: 14.7 %Yellowstone County: 4.3 %
  • Under 6.1
  • 6.1 to 7.4
  • 7.4 to 8.2
  • 8.2 to 9.4
  • 9.4 to 11
  • 11 and over
%, 2018. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2018

Garfield County: 20.9 %Garfield County20.9McCone County: 16.2 %McCone County16.2Wibaux County: 14.7 %Wibaux County14.7Carter County: 13.2 %Carter County13.2Wheatland County: 12.5 %Wheatland County12.5Roosevelt County: 11.7 %Roosevelt County11.7Liberty County: 11.3 %Liberty County11.3Chouteau County: 11.2 %Chouteau County11.2Sanders County: 11.1 %Sanders County11.1Teton County: 11 %Teton County11Granite County: 10.8 %Granite County10.8Powder River County: 10.7 %Powder River County10.7Golden Valley County: 10.6 %Golden Valley County10.6Petroleum County: 10.5 %Petroleum County10.5Fergus County: 10.2 %Fergus County10.2Phillips County: 9.9 %Phillips County9.9Sheridan County: 9.7 %Sheridan County9.7Blaine County: 9.4 %Blaine County9.4Carbon County: 9.4 %Carbon County9.4Madison County: 9.4 %Madison County9.4Prairie County: 9.4 %Prairie County9.4Daniels County: 9 %Daniels County9Ravalli County: 8.9 %Ravalli County8.9Sweet Grass County: 8.9 %Sweet Grass County8.9Rosebud County: 8.8 %Rosebud County8.8Lake County: 8.6 %Lake County8.6Treasure County: 8.6 %Treasure County8.6Beaverhead County: 8.2 %Beaverhead County8.2Meagher County: 8.2 %Meagher County8.2Richland County: 8.2 %Richland County8.2Toole County: 8.2 %Toole County8.2Judith Basin County: 8.1 %Judith Basin County8.1Fallon County: 8 %Fallon County8Glacier County: 8 %Glacier County8Big Horn County: 7.7 %Big Horn County7.7Broadwater County: 7.7 %Broadwater County7.7Musselshell County: 7.5 %Musselshell County7.5Lincoln County: 7.4 %Lincoln County7.4Powell County: 7.2 %Powell County7.2Pondera County: 7 %Pondera County7Hill County: 6.9 %Hill County6.9Mineral County: 6.8 %Mineral County6.8Park County: 6.7 %Park County6.7Custer County: 6.3 %Custer County6.3Stillwater County: 6.3 %Stillwater County6.3Valley County: 6.2 %Valley County6.2Jefferson County: 6.1 %Jefferson County6.1Deer Lodge County: 5.9 %Deer Lodge County5.9Cascade County: 5.4 %Cascade County5.4Dawson County: 5.4 %Dawson County5.4Flathead County: 5.3 %Flathead County5.3Silver Bow County: 5.2 %Silver Bow County5.2Gallatin County: 5.1 %Gallatin County5.1Lewis and Clark County: 5.1 %Lewis and Clark County5.1Missoula County: 4.5 %Missoula County4.5Yellowstone County: 4.3 %Yellowstone County4.3Garfield County: 20.9 %Garfield County20.9McCone County: 16.2 %McCone County16.2Wibaux County: 14.7 %Wibaux County14.7Carter County: 13.2 %Carter County13.2Wheatland County: 12.5 %Wheatland County12.5Roosevelt County: 11.7 %Roosevelt County11.7Liberty County: 11.3 %Liberty County11.3Chouteau County: 11.2 %Chouteau County11.2Sanders County: 11.1 %Sanders County11.1Teton County: 11 %Teton County11Granite County: 10.8 %Granite County10.8Powder River County: 10.7 %Powder River County10.7Golden Valley County: 10.6 %Golden Valley County10.6Petroleum County: 10.5 %Petroleum County10.5Fergus County: 10.2 %Fergus County10.2Phillips County: 9.9 %Phillips County9.9Sheridan County: 9.7 %Sheridan County9.7Blaine County: 9.4 %Blaine County9.4Carbon County: 9.4 %Carbon County9.4Madison County: 9.4 %Madison County9.4Prairie County: 9.4 %Prairie County9.4Daniels County: 9 %Daniels County9Ravalli County: 8.9 %Ravalli County8.9Sweet Grass County: 8.9 %Sweet Grass County8.9Rosebud County: 8.8 %Rosebud County8.8Lake County: 8.6 %Lake County8.6Treasure County: 8.6 %Treasure County8.6Beaverhead County: 8.2 %Beaverhead County8.2Meagher County: 8.2 %Meagher County8.2Richland County: 8.2 %Richland County8.2Toole County: 8.2 %Toole County8.2Judith Basin County: 8.1 %Judith Basin County8.1Fallon County: 8 %Fallon County8Glacier County: 8 %Glacier County8Big Horn County: 7.7 %Big Horn County7.7Broadwater County: 7.7 %Broadwater County7.7Musselshell County: 7.5 %Musselshell County7.5Lincoln County: 7.4 %Lincoln County7.4Powell County: 7.2 %Powell County7.2Pondera County: 7 %Pondera County7Hill County: 6.9 %Hill County6.9Mineral County: 6.8 %Mineral County6.8Park County: 6.7 %Park County6.7Custer County: 6.3 %Custer County6.3Stillwater County: 6.3 %Stillwater County6.3Valley County: 6.2 %Valley County6.2Jefferson County: 6.1 %Jefferson County6.1Deer Lodge County: 5.9 %Deer Lodge County5.9Cascade County: 5.4 %Cascade County5.4Dawson County: 5.4 %Dawson County5.4Flathead County: 5.3 %Flathead County5.3Silver Bow County: 5.2 %Silver Bow County5.2Gallatin County: 5.1 %Gallatin County5.1Lewis and Clark County: 5.1 %Lewis and Clark County5.1Missoula County: 4.5 %Missoula County4.5Yellowstone County: 4.3 %Yellowstone County4.3
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Garfield County20.9+2.8 pts
2McCone County16.2-4 pts
3Wibaux County14.7+6.1 pts
4Carter County13.2+1.9 pts
5Wheatland County12.5+0.8 pts
6Roosevelt County11.7+1.1 pts
7Liberty County11.3-9.5 pts
8Chouteau County11.2+0.1 pts
9Sanders County11.1+0.6 pts
10Teton County11+2.3 pts
11Granite County10.8-0.8 pts
12Powder River County10.7-3.3 pts
13Golden Valley County10.6-2.8 pts
14Petroleum County10.5-2.1 pts
15Fergus County10.2+3.1 pts
16Phillips County9.9-0.6 pts
17Sheridan County9.7+1.1 pts
18Blaine County9.4-0.6 pts
18Carbon County9.4-0.4 pts
18Madison County9.4-0.6 pts
18Prairie County9.4+0.2 pts
22Daniels County9+0.2 pts
23Ravalli County8.9+1.4 pts
23Sweet Grass County8.9+0.7 pts
25Rosebud County8.8-0.2 pts
26Lake County8.6+0.8 pts
26Treasure County8.6-3.6 pts
28Beaverhead County8.2+0.7 pts
28Meagher County8.2-0.5 pts
28Richland County8.2+0.1 pts
28Toole County8.2-0.7 pts
32Judith Basin County8.1-2.6 pts
33Fallon County8+0.6 pts
33Glacier County8-2.2 pts
35Big Horn County7.7-2.2 pts
35Broadwater County7.7-1 pts
37Musselshell County7.5-0.2 pts
38Lincoln County7.4+0.1 pts
39Powell County7.2+0.6 pts
40Pondera County7-0.9 pts
41Hill County6.9-0.1 pts
42Mineral County6.8-0.1 pts
43Park County6.7+0.3 pts
44Custer County6.3+1.1 pts
44Stillwater County6.3+0.4 pts
46Valley County6.2-1.8 pts
47Jefferson County6.1+0.2 pts
48Deer Lodge County5.9+0.7 pts
49Cascade County5.4+0.6 pts
49Dawson County5.4+0.3 pts
51Flathead County5.3-0.1 pts
52Silver Bow County5.2+0.4 pts
53Gallatin County5.1+0.8 pts
53Lewis and Clark County5.1+0.6 pts
55Missoula County4.5+0.1 pts
56Yellowstone County4.3-0.7 pts

Other periods

About this ranking

People under 19 without health insurance coverage of any kind, as a percentage of all people under 19. United States: Census Bureau Small Area Health Insurance Estimates (SAHIE) for states and counties, all races, both sexes and all income levels.

A model-based single-year estimate that combines the American Community Survey with administrative records and population estimates, so every county gets a figure. Covers states and counties only, because the SAHIE dataset files have no national row. The Census Bureau advises comparing years from 2008 on only; 2013 is the updated release. Under 19 matches the age limit for children in Medicaid and the Children's Health Insurance Program (CHIP).

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. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. 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). Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties (Counties in Montana by uninsured rate, under 19 (US model-based estimate), 2018) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip

MLA 9

Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties, Counties in Montana by uninsured rate, under 19 (US model-based estimate), 2018. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-under-19/montana-counties?period=2018. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. Counties in Montana by uninsured rate, under 19 (US model-based estimate), 2018. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-under-19/montana-counties?period=2018.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties, Counties in Montana by uninsured rate, under 19 (US model-based estimate), 2018 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-under-19/montana-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_montana_by_2018,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties: Counties in Montana by uninsured rate, under 19 (US model-based estimate), 2018}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-19/montana-counties?period=2018. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties: Counties in Montana by uninsured rate, under 19 (US model-based estimate), 2018
PY  - 2026
DA  - 2026/08/06
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-under-19/montana-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-19/montana-counties?period=2018.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest uninsured rate, under 19 (US model-based estimate)?

Garfield County, with 20.9% in 2018, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, under 19 (US model-based estimate)?

Yellowstone County, with 4.3% in 2018.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, under 19 (US model-based estimate): other rankings

Counties in Montana: more rankings