Data / Rankings / Uninsured rate, ages 18 to 64 (US model-based estimate) / Counties in Maine

Counties in Maine by uninsured rate, ages 18 to 64 (US model-based estimate)

Washington County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 16 counties in 2021, at 12.4%. Cumberland County had the lowest, at 6.5%. The median was 9.5% and the figure for Maine was 8.3%. Source: the U.S. Census Bureau.

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Highest12.4Washington County
Lowest6.5Cumberland County
Median9.516 counties
Maine8.3History

Map of counties, 2021

Androscoggin County: 8.3 %Aroostook County: 10.4 %Cumberland County: 6.5 %Franklin County: 9.2 %Hancock County: 9.9 %Kennebec County: 8.3 %Knox County: 9.5 %Lincoln County: 10.1 %Oxford County: 9.5 %Penobscot County: 9.1 %Piscataquis County: 10.7 %Sagadahoc County: 7.4 %Somerset County: 9.6 %Waldo County: 9.7 %Washington County: 12.4 %York County: 7.6 %
  • Under 8.3
  • 8.3 to 9.2
  • 9.2 to 9.6
  • 9.6 to 10
  • 10 and over
%, 2021. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Washington County: 12.4 %Washington County12.4Piscataquis County: 10.7 %Piscataquis County10.7Aroostook County: 10.4 %Aroostook County10.4Lincoln County: 10.1 %Lincoln County10.1Hancock County: 9.9 %Hancock County9.9Waldo County: 9.7 %Waldo County9.7Somerset County: 9.6 %Somerset County9.6Knox County: 9.5 %Knox County9.5Oxford County: 9.5 %Oxford County9.5Franklin County: 9.2 %Franklin County9.2Penobscot County: 9.1 %Penobscot County9.1Androscoggin County: 8.3 %Androscoggin County8.3Kennebec County: 8.3 %Kennebec County8.3York County: 7.6 %York County7.6Sagadahoc County: 7.4 %Sagadahoc County7.4Cumberland County: 6.5 %Cumberland County6.5Washington County: 12.4 %Washington County12.4Piscataquis County: 10.7 %Piscataquis County10.7Aroostook County: 10.4 %Aroostook County10.4Lincoln County: 10.1 %Lincoln County10.1Hancock County: 9.9 %Hancock County9.9Waldo County: 9.7 %Waldo County9.7Somerset County: 9.6 %Somerset County9.6Knox County: 9.5 %Knox County9.5Oxford County: 9.5 %Oxford County9.5Franklin County: 9.2 %Franklin County9.2Penobscot County: 9.1 %Penobscot County9.1Androscoggin County: 8.3 %Androscoggin County8.3Kennebec County: 8.3 %Kennebec County8.3York County: 7.6 %York County7.6Sagadahoc County: 7.4 %Sagadahoc County7.4Cumberland County: 6.5 %Cumberland County6.5
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Washington County12.4-2.7 pts
2Piscataquis County10.7-1.7 pts
3Aroostook County10.4-2.6 pts
4Lincoln County10.1-3.1 pts
5Hancock County9.9-2.5 pts
6Waldo County9.7-3.5 pts
7Somerset County9.6-2.9 pts
8Knox County9.5-1.9 pts
8Oxford County9.5-1.6 pts
10Franklin County9.2-2.2 pts
11Penobscot County9.1-1.9 pts
12Androscoggin County8.3-2 pts
12Kennebec County8.3-1.7 pts
14York County7.6-1.7 pts
15Sagadahoc County7.4-2.2 pts
16Cumberland County6.5-2 pts

Other periods

About this ranking

People aged 18 to 64 without health insurance coverage of any kind, as a percentage of all people aged 18 to 64. 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. Working-age adults; the rate for everyone under 65 is uninsured_rate_under_65.

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, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-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, ages 18 to 64, all races, both sexes, all income levels, states and counties (Counties in Maine by uninsured rate, ages 18 to 64 (US model-based estimate), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip

MLA 9

Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in Maine by uninsured rate, ages 18 to 64 (US model-based estimate), 2021. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maine-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Counties in Maine by uninsured rate, ages 18 to 64 (US model-based estimate), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maine-counties?period=2021.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in Maine by uninsured rate, ages 18 to 64 (US model-based estimate), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/maine-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in Maine by uninsured rate, ages 18 to 64 (US model-based estimate), 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maine-counties?period=2021. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in Maine by uninsured rate, ages 18 to 64 (US model-based estimate), 2021
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-2021-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/maine-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maine-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest uninsured rate, ages 18 to 64 (US model-based estimate)?

Washington County, with 12.4% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 18 to 64 (US model-based estimate)?

Cumberland County, with 6.5% 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, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, ages 18 to 64 (US model-based estimate): other rankings

Counties in Maine: more rankings