New Hampshire Counties by Population (2026)
by Kristen Carney
Updated: February 9, 2026
The most populous counties in New Hampshire are Hillsborough County with 426,378, Rockingham County at 319,082, Merrimack County with 155,967, Strafford County at 132,575, and Grafton County with 92,120. 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 American Community Survey.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest New Hampshire counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
| Rank | County | Population |
|---|---|---|
| 1 | Hillsborough County | 426,378 |
| 2 | Rockingham County | 319,082 |
| 3 | Merrimack County | 155,967 |
| 4 | Strafford County | 132,575 |
| 5 | Grafton County | 92,120 |
| 6 | Cheshire County | 77,297 |
| 7 | Belknap County | 64,659 |
| 8 | Carroll County | 51,804 |
| 9 | Sullivan County | 43,715 |
| 10 | Coos County | 31,271 |
|
United States Census Bureau. B01001 SEX BY AGE, 2024 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. January 29, 2026. http://www.census.gov/. |
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