16 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Londonderry | Rockingham County | 27,004 |
| Laconia | Belknap County | 17,290 |
| Lebanon | Grafton County | 15,988 |
| Litchfield | Hillsborough County | 8,480 |
| Littleton | Grafton County | 5,942 |
| Loudon | Merrimack County | 5,758 |
| Lee | Strafford County | 4,616 |
| Lancaster | Coos County | 3,211 |
| Lyme | Grafton County | 1,713 |
| Lyndeborough | Hillsborough County | 1,697 |
| Lincoln | Grafton County | 1,638 |
| Lisbon | Grafton County | 1,621 |
| Lempster | Sullivan County | 1,155 |
| Langdon | Sullivan County | 676 |
| Lyman | Grafton County | 579 |
| Landaff | Grafton County | 440 |