Ranking of Massachusetts Counties By Number of People and Percentage of Population With No Health Insurance Coverage in 2021 (ACS-5Yrs)

Updated on October 27, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the percentage of the Massachusetts population without a health insurance coverage was 2.78% (i.e. 192,326 people). Percentagewise, among all Massachusetts counties, Dukes County had the highest percentage of its population with no health insurance coverage (6.22%), followed by Nantucket County (6.07%), and Suffolk County (3.63%).

In numerical terms, Middlesex County had the highest number of people without a health insurance coverage (42,769), followed by Suffolk County (28,535), and Essex County (24,080).

The charts below shows the top 10 counties by the number of people and percentage of the population without a health insurance coverage. The tables below shows the ranking for all Massachusetts counties.

You can see similar information for other types of health insurance coverages.

You can also see similar information for other states.

Ranking of Massachusetts Counties By Percentage of Population With No Health Insurance Coverage in 2021
Dukes County
Nantucket County
Suffolk County
Barnstable County
Bristol County
Hampden County
Essex County
Middlesex County
Plymouth County
Hampshire County
Ranking of Massachusetts Counties By Number of People With No Health Insurance Coverage in 2021
Middlesex County
Suffolk County
Essex County
Worcester County
Bristol County
Hampden County
Norfolk County
Plymouth County
Barnstable County
Hampshire County
Ranking of Massachusetts Counties By Percentage of Population With No Health Insurance Coverage in 2021
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Rank County Percentage of Population (%)
1 Dukes County 6.22
2 Nantucket County 6.07
3 Suffolk County 3.63
4 Barnstable County 3.27
5 Bristol County 3.08
6 Hampden County 3.05
7 Essex County 3.02
8 Middlesex County 2.66
9 Plymouth County 2.52
10 Hampshire County 2.40
10 Worcester County 2.40
11 Berkshire County 2.36
12 Franklin County 2.28
13 Norfolk County 1.97
Ranking of Massachusetts Counties By Number of People With NO Health Insurance Coverage in 2021
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Rank County Number of People
1 Middlesex County 42769
2 Suffolk County 28535
3 Essex County 24080
4 Worcester County 20285
5 Bristol County 17562
6 Hampden County 14065
7 Norfolk County 14005
8 Plymouth County 13115
9 Barnstable County 7369
10 Hampshire County 3848
11 Berkshire County 2996
12 Franklin County 1606
13 Dukes County 1255
14 Nantucket County 836