New Hampshire Counties By Population

The most populous counties in New Hampshire are Hillsborough County with 430,462, Rockingham County at 322,433, Merrimack County with 157,869, Strafford County at 134,202, and Grafton County with 93,045. 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 2024 Population Estimates Program.

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Rank County Population
1 Hillsborough County 430,462
2 Rockingham County 322,433
3 Merrimack County 157,869
4 Strafford County 134,202
5 Grafton County 93,045
6 Cheshire County 78,078
7 Belknap County 65,257
8 Carroll County 52,580
9 Sullivan County 44,012
10 Coos County 31,094

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2024. Population Division. May 2025.

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