STATE ยท NH
Counties in New Hampshire
New Hampshire has 10 counties and county equivalents. The most populous is Hillsborough County with 427,354 people (Census 2023 estimate).
| County | Type | FIPS | Population (2023) |
|---|---|---|---|
| Belknap County | county | 33001 | 65,027 |
| Carroll County | county | 33003 | 52,448 |
| Cheshire County | county | 33005 | 77,703 |
| Coos County | county | 33007 | 31,372 |
| Grafton County | county | 33009 | 93,146 |
| Hillsborough County | county | 33011 | 427,354 |
| Merrimack County | county | 33013 | 157,103 |
| Rockingham County | county | 33015 | 320,689 |
| Strafford County | county | 33017 | 133,243 |
| Sullivan County | county | 33019 | 43,969 |
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27. Looking for yours? Find your county.