Ranking of New Hampshire Counties By Population with Unclassified Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 250.60K people in New Hampshire with Unclassified ancestry. Among all New Hampshire counties, Hillsborough County had the highest population with Unclassified ancestry (71.10K), followed by Rockingham County (50.97K), and Merrimack County (29.54K).

The chart and table below shows the top 10 counties with high number of people with Unclassified ancestry.

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

Data Source: US Census Bureau.
Ranking of New Hampshire Counties By Population with Unclassified Ancestry in 2021
Hillsborough County
Rockingham County
Merrimack County
Strafford County
Grafton County
Cheshire County
Belknap County
Sullivan County
Carroll County
Coos County
Ranking of New Hampshire Counties By Population with Unclassified Ancestry in 2021
0 of 0
Rank County Population
1 Hillsborough County 71103
2 Rockingham County 50973
3 Merrimack County 29537
4 Strafford County 25127
5 Grafton County 17748
6 Cheshire County 15894
7 Belknap County 13123
8 Sullivan County 10582
9 Carroll County 9790
10 Coos County 6724