Data / Rankings / Uninsured rate, all ages (US) / Counties in Massachusetts

Counties in Massachusetts by uninsured rate, all ages (US)

Dukes County had the highest uninsured rate, all ages (US) of 14 counties in 2021, at 6.2%. Norfolk County had the lowest, at 2%. The median was 2.8% and the figure for Massachusetts was 2.8%. Source: the U.S. Census Bureau.

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Highest6.2Dukes County
Lowest2Norfolk County
Median2.814 counties
Massachusetts2.8History

Map of counties, 2021

Barnstable County: 3.3 %Berkshire County: 2.4 %Bristol County: 3.1 %Dukes County: 6.2 %Essex County: 3 %Franklin County: 2.3 %Hampden County: 3.1 %Hampshire County: 2.4 %Middlesex County: 2.7 %Nantucket County: 6.1 %Norfolk County: 2 %Plymouth County: 2.5 %Suffolk County: 3.6 %Worcester County: 2.4 %
  • Under 2.4
  • 2.4 to 2.5
  • 2.5 to 3
  • 3 to 3.4
  • 3.4 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Dukes County: 6.2 %Dukes County6.2Nantucket County: 6.1 %Nantucket County6.1Suffolk County: 3.6 %Suffolk County3.6Barnstable County: 3.3 %Barnstable County3.3Bristol County: 3.1 %Bristol County3.1Hampden County: 3.1 %Hampden County3.1Essex County: 3 %Essex County3Middlesex County: 2.7 %Middlesex County2.7Plymouth County: 2.5 %Plymouth County2.5Hampshire County: 2.4 %Hampshire County2.4Worcester County: 2.4 %Worcester County2.4Berkshire County: 2.4 %Berkshire County2.4Franklin County: 2.3 %Franklin County2.3Norfolk County: 2 %Norfolk County2Dukes County: 6.2 %Dukes County6.2Nantucket County: 6.1 %Nantucket County6.1Suffolk County: 3.6 %Suffolk County3.6Barnstable County: 3.3 %Barnstable County3.3Bristol County: 3.1 %Bristol County3.1Hampden County: 3.1 %Hampden County3.1Essex County: 3 %Essex County3Middlesex County: 2.7 %Middlesex County2.7Plymouth County: 2.5 %Plymouth County2.5Hampshire County: 2.4 %Hampshire County2.4Worcester County: 2.4 %Worcester County2.4Berkshire County: 2.4 %Berkshire County2.4Franklin County: 2.3 %Franklin County2.3Norfolk County: 2 %Norfolk County2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Dukes County6.2
2Nantucket County6.1
3Suffolk County3.6
4Barnstable County3.3
5Bristol County3.1
6Hampden County3.1
7Essex County3
8Middlesex County2.7
9Plymouth County2.5
10Hampshire County2.4
10Worcester County2.4
12Berkshire County2.4
13Franklin County2.3
14Norfolk County2

Other periods

About this ranking

People without health insurance coverage of any kind, as a percentage of the civilian noninstitutionalized population. 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs (Counties in Massachusetts by uninsured rate, all ages (US), 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs, Counties in Massachusetts by uninsured rate, all ages (US), 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/massachusetts-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs. Counties in Massachusetts by uninsured rate, all ages (US), 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/massachusetts-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs, Counties in Massachusetts by uninsured rate, all ages (US), 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/massachusetts-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_massachusetts_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs: Counties in Massachusetts by uninsured rate, all ages (US), 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/massachusetts-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs: Counties in Massachusetts by uninsured rate, all ages (US), 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/massachusetts-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate/massachusetts-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, 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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Rank Counties in Massachusetts by uninsured rate, all ages (US) using official data, and cite the source.
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Questions

Which county has the highest uninsured rate, all ages (US)?

Dukes County, with 6.2% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, all ages (US)?

Norfolk County, with 2% 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs. Retrieved 2026-10-12.

Uninsured rate, all ages (US): other rankings

Counties in Massachusetts: more rankings