Ranking of Massachusetts Counties By Percentage of Population with Unclassified Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.30M people in Massachusetts with Unclassified ancestry (18.52% of Massachusetts population). Among all Massachusetts counties, Nantucket County had the highest percentage of its population with Unclassified ancestry (29.20%), followed by Berkshire County (22.34%), and Hampshire County (22.22%).
The chart and table below shows the top 10 counties with high percentage of its population having Unclassified ancestry.
You can see similar information for other states and for other ancestry groups in Massachusetts.
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Related Topics: Massachusetts ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Massachusetts Counties By Percentage of Population with Unclassified Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Nantucket County | 29.20 |
| 2 | Berkshire County | 22.34 |
| 3 | Hampshire County | 22.22 |
| 4 | Franklin County | 19.68 |
| 5 | Suffolk County | 19.36 |
| 6 | Dukes County | 18.88 |
| 7 | Worcester County | 18.50 |
| 8 | Barnstable County | 18.47 |
| 9 | Middlesex County | 18.35 |
| 10 | Hampden County | 18.17 |
| 11 | Norfolk County | 18.14 |
| 12 | Essex County | 18.04 |
| 13 | Plymouth County | 17.75 |
| 14 | Bristol County | 17.70 |
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