Ranking of Massachusetts Counties By Percentage of Population with Scotch Irish Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 41.71K people in Massachusetts with Scotch Irish ancestry (0.60% of Massachusetts population). Among all Massachusetts counties, Franklin County had the highest percentage of its population with Scotch Irish ancestry (1.17%), followed by Barnstable County (0.96%), and Nantucket County (0.94%).

The chart and table below shows the top 10 counties with high percentage of its population having Scotch Irish 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 Scotch Irish Ancestry in 2021
Franklin County
Barnstable County
Nantucket County
Plymouth County
Hampshire County
Middlesex County
Berkshire County
Essex County
Dukes County
Worcester County
Ranking of Massachusetts Counties By Percentage of Population with Scotch Irish Ancestry in 2021
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Rank County Percentage of Pop. (%)
1 Franklin County 1.17
2 Barnstable County 0.96
3 Nantucket County 0.94
4 Plymouth County 0.91
5 Hampshire County 0.81
6 Middlesex County 0.71
7 Berkshire County 0.64
7 Essex County 0.64
8 Dukes County 0.62
9 Worcester County 0.57
10 Norfolk County 0.56
11 Hampden County 0.37
12 Suffolk County 0.33
13 Bristol County 0.30