Ranking of Massachusetts Counties By Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)

Updated on September 3, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the population of Massachusetts (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 433,215. Among all Massachusetts counties, Middlesex County had the highest population (aged 25 years and above) with an educational attainment of Less than High School Diploma (73,449), followed by Suffolk County (71,809), and Essex County (57,431).

The chart below shows the top 10 Massachusetts counties, and the table below shows the ranking of all Massachusetts counties.

You can see similar information for other educational attainments.

You can also see similar information for other states and for the United States.

Ranking of Massachusetts Counties By Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Middlesex County
Suffolk County
Essex County
Bristol County
Worcester County
Hampden County
Norfolk County
Plymouth County
Barnstable County
Berkshire County
Ranking of Massachusetts Counties By Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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Rank County Number of People
1 Middlesex County 73449
2 Suffolk County 71809
3 Essex County 57431
4 Bristol County 57348
5 Worcester County 50122
6 Hampden County 44183
7 Norfolk County 29456
8 Plymouth County 25872
9 Barnstable County 7686
10 Berkshire County 6625
11 Hampshire County 4744
12 Franklin County 3450
13 Dukes County 652
14 Nantucket County 388