16 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Londonderry | Rockingham County | 27,281 |
| Laconia | Belknap County | 17,473 |
| Lebanon | Grafton County | 15,442 |
| Litchfield | Hillsborough County | 8,604 |
| Littleton | Grafton County | 6,029 |
| Loudon | Merrimack County | 5,755 |
| Lee | Strafford County | 4,581 |
| Lancaster | Coos County | 3,201 |
| Lyme | Grafton County | 1,723 |
| Lyndeborough | Hillsborough County | 1,719 |
| Lincoln | Grafton County | 1,664 |
| Lisbon | Grafton County | 1,637 |
| Lempster | Sullivan County | 1,166 |
| Langdon | Sullivan County | 662 |
| Lyman | Grafton County | 579 |
| Landaff | Grafton County | 440 |