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

Counties in Massachusetts by uninsured rate, all ages (US), 2024

Nantucket County had the highest uninsured rate, all ages (US) of 14 counties in 2024, at 7.8%. Berkshire County had the lowest, at 1.7%. The median was 2.5% and the figure for Massachusetts was 2.6%. Source: the U.S. Census Bureau.

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Highest7.8Nantucket County
Lowest1.7Berkshire County
Median2.514 counties
Massachusetts2.6History

Map of counties, 2024

Barnstable County: 2.7 %Berkshire County: 1.7 %Bristol County: 3.3 %Dukes County: 2.2 %Essex County: 2.8 %Franklin County: 2.1 %Hampden County: 3.1 %Hampshire County: 1.8 %Middlesex County: 2.4 %Nantucket County: 7.8 %Norfolk County: 1.9 %Plymouth County: 2.5 %Suffolk County: 3.1 %Worcester County: 2.5 %
  • Under 2
  • 2 to 2.4
  • 2.4 to 2.6
  • 2.6 to 3.1
  • 3.1 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2024

Nantucket County: 7.8 %Nantucket County7.8Bristol County: 3.3 %Bristol County3.3Suffolk County: 3.1 %Suffolk County3.1Hampden County: 3.1 %Hampden County3.1Essex County: 2.8 %Essex County2.8Barnstable County: 2.7 %Barnstable County2.7Worcester County: 2.5 %Worcester County2.5Plymouth County: 2.5 %Plymouth County2.5Middlesex County: 2.4 %Middlesex County2.4Dukes County: 2.2 %Dukes County2.2Franklin County: 2.1 %Franklin County2.1Norfolk County: 1.9 %Norfolk County1.9Hampshire County: 1.8 %Hampshire County1.8Berkshire County: 1.7 %Berkshire County1.7Nantucket County: 7.8 %Nantucket County7.8Bristol County: 3.3 %Bristol County3.3Suffolk County: 3.1 %Suffolk County3.1Hampden County: 3.1 %Hampden County3.1Essex County: 2.8 %Essex County2.8Barnstable County: 2.7 %Barnstable County2.7Worcester County: 2.5 %Worcester County2.5Plymouth County: 2.5 %Plymouth County2.5Middlesex County: 2.4 %Middlesex County2.4Dukes County: 2.2 %Dukes County2.2Franklin County: 2.1 %Franklin County2.1Norfolk County: 1.9 %Norfolk County1.9Hampshire County: 1.8 %Hampshire County1.8Berkshire County: 1.7 %Berkshire County1.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Nantucket County7.8+1.3 pts
2Bristol County3.3+0.3 pts
3Suffolk County3.1-0.2 pts
4Hampden County3.1-0.1 pts
5Essex County2.8-0 pts
6Barnstable County2.7-0.2 pts
7Worcester County2.5-0.1 pts
8Plymouth County2.50 pts
9Middlesex County2.4-0.1 pts
10Dukes County2.2-2.8 pts
11Franklin County2.1-0.2 pts
12Norfolk County1.9-0 pts
13Hampshire County1.8-0.2 pts
14Berkshire County1.7-0.4 pts

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/2024/table-based-SF/data/5YRData/acsdt5y2024-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), 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-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), 2024. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat. Invokely, https://invokely.ai/rankings/uninsured-rate/massachusetts-counties. 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), 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate/massachusetts-counties.

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), 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat, via Invokely: https://invokely.ai/rankings/uninsured-rate/massachusetts-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_massachusetts_by_2024,
  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), 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate/massachusetts-counties. 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/2024/table-based-SF/data/5YRData/acsdt5y2024-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), 2024
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b27010.dat
L2  - https://invokely.ai/rankings/uninsured-rate/massachusetts-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate/massachusetts-counties.
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/2024/table-based-SF/data/5YRData/acsdt5y2024-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.
rank_places {"indicator":"uninsured_rate","level":"province","within":"Massachusetts","limit":10}
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Questions

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

Nantucket County, with 7.8% in 2024, according to the U.S. Census Bureau.

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

Berkshire County, with 1.7% in 2024.

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