New Hampshire Counties by Population

The most populated counties in New Hampshire are Hillsborough County with 422,733, Rockingham County at 315,169, Merrimack County with 153,918, Strafford County at 130,965, and Grafton County with 90,836. You can get the most current Census population data for all 10 New Hampshire counties, sorted from the most populous counties in New Hampshire to the least, according to the 2022 American Community Survey.

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Rank County Population
1 Hillsborough County 422,733
2 Rockingham County 315,169
3 Merrimack County 153,918
4 Strafford County 130,965
5 Grafton County 90,836
6 Cheshire County 76,610
7 Belknap County 63,914
8 Carroll County 50,679
9 Sullivan County 43,356
10 Coos County 31,430

United States Census Bureau. B01001 SEX BY AGE, 2022 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 7 December 2023.


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