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 2018, at 18.6%. Sagadahoc County had the lowest, at 9.5%. The median was 13.3% and the figure for Maine was 11.7%. Source: the U.S. Census Bureau.

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Highest18.6Washington County
Lowest9.5Sagadahoc County
Median13.316 counties
Maine11.7History

Map of counties, 2018

Androscoggin County: 11.6 %Aroostook County: 15.4 %Cumberland County: 9.6 %Franklin County: 12.6 %Hancock County: 13.4 %Kennebec County: 10.5 %Knox County: 13.2 %Lincoln County: 14.8 %Oxford County: 13.6 %Penobscot County: 13.3 %Piscataquis County: 14 %Sagadahoc County: 9.5 %Somerset County: 13.5 %Waldo County: 13.1 %Washington County: 18.6 %York County: 9.8 %
  • Under 11
  • 11 to 13
  • 13 to 14
  • 14 and over
%, 2018. 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, 2018

Washington County: 18.6 %Washington County18.6Aroostook County: 15.4 %Aroostook County15.4Lincoln County: 14.8 %Lincoln County14.8Piscataquis County: 14 %Piscataquis County14Oxford County: 13.6 %Oxford County13.6Somerset County: 13.5 %Somerset County13.5Hancock County: 13.4 %Hancock County13.4Penobscot County: 13.3 %Penobscot County13.3Knox County: 13.2 %Knox County13.2Waldo County: 13.1 %Waldo County13.1Franklin County: 12.6 %Franklin County12.6Androscoggin County: 11.6 %Androscoggin County11.6Kennebec County: 10.5 %Kennebec County10.5York County: 9.8 %York County9.8Cumberland County: 9.6 %Cumberland County9.6Sagadahoc County: 9.5 %Sagadahoc County9.5Washington County: 18.6 %Washington County18.6Aroostook County: 15.4 %Aroostook County15.4Lincoln County: 14.8 %Lincoln County14.8Piscataquis County: 14 %Piscataquis County14Oxford County: 13.6 %Oxford County13.6Somerset County: 13.5 %Somerset County13.5Hancock County: 13.4 %Hancock County13.4Penobscot County: 13.3 %Penobscot County13.3Knox County: 13.2 %Knox County13.2Waldo County: 13.1 %Waldo County13.1Franklin County: 12.6 %Franklin County12.6Androscoggin County: 11.6 %Androscoggin County11.6Kennebec County: 10.5 %Kennebec County10.5York County: 9.8 %York County9.8Cumberland County: 9.6 %Cumberland County9.6Sagadahoc County: 9.5 %Sagadahoc County9.5
%. 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

RankCounties2018 (%)Change on 2017
1Washington County18.6+0.4 pts
2Aroostook County15.4+1.6 pts
3Lincoln County14.8-0.6 pts
4Piscataquis County14+0.2 pts
5Oxford County13.6+0.4 pts
6Somerset County13.5-0.8 pts
7Hancock County13.4-0.1 pts
8Penobscot County13.3+0.4 pts
9Knox County13.2-0.3 pts
10Waldo County13.1-1.2 pts
11Franklin County12.60 pts
12Androscoggin County11.6+0.2 pts
13Kennebec County10.5-0.9 pts
14York County9.8-0.1 pts
15Cumberland County9.6-1 pts
16Sagadahoc County9.5-0.3 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-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, 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), 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, 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), 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-ages-18-64/maine-counties?period=2018. 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), 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-ages-18-64/maine-counties?period=2018.

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), 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-ages-18-64/maine-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2018,
  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), 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-ages-18-64/maine-counties?period=2018. 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-2018-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), 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-ages-18-64/maine-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maine-counties?period=2018.
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-2018-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 18.6% in 2018, according to the U.S. Census Bureau.

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

Sagadahoc County, with 9.5% 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, 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