| City | County | 2026 Pop. ↓ |
|---|---|---|
| Salem | Rockingham County | 32,114 |
| Somersworth | Strafford County | 12,126 |
| Seabrook | Rockingham County | 8,424 |
| Stratham | Rockingham County | 7,728 |
| Swanzey | Cheshire County | 7,451 |
| Sandown | Rockingham County | 6,792 |
| Strafford | Strafford County | 4,326 |
| Sunapee | Sullivan County | 3,439 |
| Sanbornton | Belknap County | 3,035 |
| Sutton | Merrimack County | 2,067 |
| Sandwich | Carroll County | 1,554 |
| Salisbury | Merrimack County | 1,528 |
| Stoddard | Cheshire County | 1,483 |
| Springfield | Sullivan County | 1,304 |
| South Hampton | Rockingham County | 892 |
| Surry | Cheshire County | 860 |
| Stewartstown | Coos County | 770 |
| Sullivan | Cheshire County | 697 |
| Sugar Hill | Grafton County | 695 |
| Stratford | Coos County | 642 |
| Stark | Coos County | 460 |
| Shelburne | Coos County | 365 |
| Sharon | Hillsborough County | 356 |