New Hampshire Counties by Population (2024)

by Kristen Carney Kristen Carney

Updated: June 20, 2024

The most populous counties in New Hampshire are Hillsborough County with 427,354, Rockingham County at 320,689, Merrimack County with 157,103, Strafford County at 133,243, and Grafton County with 93,146. 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 2023 Population Estimates Program.

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Rank County Population
1 Hillsborough County 427,354
2 Rockingham County 320,689
3 Merrimack County 157,103
4 Strafford County 133,243
5 Grafton County 93,146
6 Cheshire County 77,703
7 Belknap County 65,027
8 Carroll County 52,448
9 Sullivan County 43,969
10 Coos County 31,372

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2023. Population Division. May 2024.

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