23 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Salem | Rockingham County | 31,793 |
| Somersworth | Strafford County | 12,247 |
| Seabrook | Rockingham County | 8,462 |
| Stratham | Rockingham County | 7,760 |
| Swanzey | Cheshire County | 7,489 |
| Sandown | Rockingham County | 6,780 |
| Strafford | Strafford County | 4,343 |
| Sunapee | Sullivan County | 3,465 |
| Sanbornton | Belknap County | 3,048 |
| Sutton | Merrimack County | 2,096 |
| Sandwich | Carroll County | 1,553 |
| Salisbury | Merrimack County | 1,514 |
| Stoddard | Cheshire County | 1,467 |
| Springfield | Sullivan County | 1,321 |
| South Hampton | Rockingham County | 893 |
| Surry | Cheshire County | 868 |
| Stewartstown | Coos County | 771 |
| Sullivan | Cheshire County | 707 |
| Sugar Hill | Grafton County | 687 |
| Stratford | Coos County | 647 |
| Stark | Coos County | 464 |
| Shelburne | Coos County | 361 |
| Sharon | Hillsborough County | 353 |