Ranking of Massachusetts Counties By Percentage of Population with American Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 260.36K people in Massachusetts with American ancestry (3.72% of Massachusetts population). Among all Massachusetts counties, Worcester County had the highest percentage of its population with American ancestry (5.88%), followed by Hampden County (5.07%), and Hampshire County (4.74%).

The chart and table below shows the top 10 counties with high percentage of its population having American ancestry.

You can see similar information for other states and for other ancestry groups in Massachusetts.

Data Source: US Census Bureau.
Ranking of Massachusetts Counties By Percentage of Population with American Ancestry in 2021
Worcester County
Hampden County
Hampshire County
Berkshire County
Plymouth County
Barnstable County
Franklin County
Norfolk County
Dukes County
Nantucket County
Ranking of Massachusetts Counties By Percentage of Population with American Ancestry in 2021
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Rank County Percentage of Pop. (%)
1 Worcester County 5.88
2 Hampden County 5.07
3 Hampshire County 4.74
4 Berkshire County 4.37
5 Plymouth County 4.28
6 Barnstable County 4.16
7 Franklin County 3.98
8 Norfolk County 3.90
9 Dukes County 3.39
9 Nantucket County 3.39
10 Middlesex County 3.29
11 Bristol County 2.82
12 Essex County 2.70
13 Suffolk County 2.22