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

Counties in Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate), 2024

Dukes County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 14 counties in 2024, at 5.5%. Norfolk County had the lowest, at 2.7%. The median was 3.7% and the figure for Massachusetts was 3.7%. Source: the U.S. Census Bureau.

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Highest5.5Dukes County
Lowest2.7Norfolk County
Median3.714 counties
Massachusetts3.7History

Map of counties, 2024

Barnstable County: 3.4 %Berkshire County: 3.6 %Bristol County: 5 %Dukes County: 5.5 %Essex County: 4.2 %Franklin County: 3.6 %Hampden County: 4.5 %Hampshire County: 3 %Middlesex County: 3.3 %Nantucket County: 4.3 %Norfolk County: 2.7 %Plymouth County: 3.6 %Suffolk County: 4 %Worcester County: 3.7 %
  • Under 3.4
  • 3.4 to 3.6
  • 3.6 to 3.9
  • 3.9 to 4.4
  • 4.4 and over
%, 2024. 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, 2024

Dukes County: 5.5 %Dukes County5.5Bristol County: 5 %Bristol County5Hampden County: 4.5 %Hampden County4.5Nantucket County: 4.3 %Nantucket County4.3Essex County: 4.2 %Essex County4.2Suffolk County: 4 %Suffolk County4Worcester County: 3.7 %Worcester County3.7Berkshire County: 3.6 %Berkshire County3.6Franklin County: 3.6 %Franklin County3.6Plymouth County: 3.6 %Plymouth County3.6Barnstable County: 3.4 %Barnstable County3.4Middlesex County: 3.3 %Middlesex County3.3Hampshire County: 3 %Hampshire County3Norfolk County: 2.7 %Norfolk County2.7Dukes County: 5.5 %Dukes County5.5Bristol County: 5 %Bristol County5Hampden County: 4.5 %Hampden County4.5Nantucket County: 4.3 %Nantucket County4.3Essex County: 4.2 %Essex County4.2Suffolk County: 4 %Suffolk County4Worcester County: 3.7 %Worcester County3.7Berkshire County: 3.6 %Berkshire County3.6Franklin County: 3.6 %Franklin County3.6Plymouth County: 3.6 %Plymouth County3.6Barnstable County: 3.4 %Barnstable County3.4Middlesex County: 3.3 %Middlesex County3.3Hampshire County: 3 %Hampshire County3Norfolk County: 2.7 %Norfolk County2.7
%. 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

RankCounties2024 (%)Change on 2023
1Dukes County5.50 pts
2Bristol County5+0.5 pts
3Hampden County4.50 pts
4Nantucket County4.3+1 pts
5Essex County4.20 pts
6Suffolk County40 pts
7Worcester County3.7-0.1 pts
8Berkshire County3.6+0.4 pts
8Franklin County3.6+0.2 pts
8Plymouth County3.6+0.4 pts
11Barnstable County3.4-0.2 pts
12Middlesex County3.3+0.4 pts
13Hampshire County3+0.3 pts
14Norfolk County2.7+0.2 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-2024-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 Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate), 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-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 Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate), 2024. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/massachusetts-counties. 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 Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate), 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/massachusetts-counties.

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 Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate), 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/massachusetts-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_massachusetts_by_2024,
  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 Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate), 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/massachusetts-counties. 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-2024-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 Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate), 2024
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-2024-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/massachusetts-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/massachusetts-counties.
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-2024-csv.zip. Retrieved 2026-10-12.
ER  -
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Rank Counties in Massachusetts by uninsured rate, ages 18 to 64 (US model-based estimate) using official data, and cite the source.
rank_places {"indicator":"uninsured_rate_18_64","level":"province","within":"Massachusetts","limit":10}
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Questions

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

Dukes County, with 5.5% in 2024, according to the U.S. Census Bureau.

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

Norfolk County, with 2.7% 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, 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 Massachusetts: more rankings