| City | County | 2026 Pop. ↓ |
|---|---|---|
| Dover | Strafford County | 35,343 |
| Derry | Rockingham County | 33,944 |
| Durham | Strafford County | 15,272 |
| Deerfield | Rockingham County | 5,007 |
| Danville | Rockingham County | 4,672 |
| Dunbarton | Merrimack County | 3,286 |
| Deering | Hillsborough County | 1,938 |
| Dublin | Cheshire County | 1,622 |
| Danbury | Merrimack County | 1,335 |
| Dalton | Coos County | 902 |
| Dorchester | Grafton County | 345 |
| Dummer | Coos County | 314 |