Data / Rankings / Uninsured rate, under 19 (US model-based estimate) / Counties in Massachusetts

Counties in Massachusetts by uninsured rate, under 19 (US model-based estimate)

Nantucket County had the highest uninsured rate, under 19 (US model-based estimate) of 14 counties in 2021, at 2.1%. Norfolk County had the lowest, at 0.9%. The median was 1.2% and the figure for Massachusetts was 1.1%. Source: the U.S. Census Bureau.

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Highest2.1Nantucket County
Lowest0.9Norfolk County
Median1.214 counties
Massachusetts1.1History

Map of counties, 2021

Barnstable County: 1.2 %Berkshire County: 1.2 %Bristol County: 1.3 %Dukes County: 2 %Essex County: 1.2 %Franklin County: 1.2 %Hampden County: 1.4 %Hampshire County: 1 %Middlesex County: 1.1 %Nantucket County: 2.1 %Norfolk County: 0.9 %Plymouth County: 1.1 %Suffolk County: 1.1 %Worcester County: 1.1 %
  • Under 1.1
  • 1.1 to 1.2
  • 1.2 to 1.3
  • 1.3 and over
%, 2021. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Nantucket County: 2.1 %Nantucket County2.1Dukes County: 2 %Dukes County2Hampden County: 1.4 %Hampden County1.4Bristol County: 1.3 %Bristol County1.3Barnstable County: 1.2 %Barnstable County1.2Berkshire County: 1.2 %Berkshire County1.2Essex County: 1.2 %Essex County1.2Franklin County: 1.2 %Franklin County1.2Middlesex County: 1.1 %Middlesex County1.1Plymouth County: 1.1 %Plymouth County1.1Suffolk County: 1.1 %Suffolk County1.1Worcester County: 1.1 %Worcester County1.1Hampshire County: 1 %Hampshire County1Norfolk County: 0.9 %Norfolk County0.9Nantucket County: 2.1 %Nantucket County2.1Dukes County: 2 %Dukes County2Hampden County: 1.4 %Hampden County1.4Bristol County: 1.3 %Bristol County1.3Barnstable County: 1.2 %Barnstable County1.2Berkshire County: 1.2 %Berkshire County1.2Essex County: 1.2 %Essex County1.2Franklin County: 1.2 %Franklin County1.2Middlesex County: 1.1 %Middlesex County1.1Plymouth County: 1.1 %Plymouth County1.1Suffolk County: 1.1 %Suffolk County1.1Worcester County: 1.1 %Worcester County1.1Hampshire County: 1 %Hampshire County1Norfolk County: 0.9 %Norfolk County0.9
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Nantucket County2.1-1.1 pts
2Dukes County2-1.7 pts
3Hampden County1.4-1 pts
4Bristol County1.3-0.6 pts
5Barnstable County1.2-0.7 pts
5Berkshire County1.2-0.7 pts
5Essex County1.2-0.6 pts
5Franklin County1.2-0.6 pts
9Middlesex County1.1-0.4 pts
9Plymouth County1.1-0.7 pts
9Suffolk County1.1-1.2 pts
9Worcester County1.1-0.4 pts
13Hampshire County1-0.7 pts
14Norfolk County0.9-0.4 pts

Other periods

About this ranking

People under 19 without health insurance coverage of any kind, as a percentage of all people under 19. 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. Under 19 matches the age limit for children in Medicaid and the Children's Health Insurance Program (CHIP).

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, under 19, 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, under 19, all races, both sexes, all income levels, states and counties (Counties in Massachusetts by uninsured rate, under 19 (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, under 19, all races, both sexes, all income levels, states and counties, Counties in Massachusetts by uninsured rate, under 19 (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-under-19/massachusetts-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties. Counties in Massachusetts by uninsured rate, under 19 (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-under-19/massachusetts-counties?period=2021.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties, Counties in Massachusetts by uninsured rate, under 19 (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-under-19/massachusetts-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_massachusetts_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, all races, both sexes, all income levels, states and counties: Counties in Massachusetts by uninsured rate, under 19 (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-under-19/massachusetts-counties?period=2021. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, 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, under 19, all races, both sexes, all income levels, states and counties: Counties in Massachusetts by uninsured rate, under 19 (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-under-19/massachusetts-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-19/massachusetts-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 19, 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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Rank Counties in Massachusetts by uninsured rate, under 19 (US model-based estimate) using official data, and cite the source.
rank_places {"indicator":"uninsured_rate_under_19","level":"province","within":"Massachusetts","limit":10}
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Questions

Which county has the highest uninsured rate, under 19 (US model-based estimate)?

Nantucket County, with 2.1% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, under 19 (US model-based estimate)?

Norfolk County, with 0.9% 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, under 19, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, under 19 (US model-based estimate): other rankings

Counties in Massachusetts: more rankings