16 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Londonderry | Rockingham County | 27,461 |
| Laconia | Belknap County | 17,636 |
| Lebanon | Grafton County | 15,495 |
| Litchfield | Hillsborough County | 8,654 |
| Littleton | Grafton County | 6,026 |
| Loudon | Merrimack County | 5,770 |
| Lee | Strafford County | 4,576 |
| Lancaster | Coos County | 3,190 |
| Lyndeborough | Hillsborough County | 1,726 |
| Lyme | Grafton County | 1,716 |
| Lincoln | Grafton County | 1,674 |
| Lisbon | Grafton County | 1,636 |
| Lempster | Sullivan County | 1,174 |
| Langdon | Sullivan County | 660 |
| Lyman | Grafton County | 574 |
| Landaff | Grafton County | 438 |