| City | County | 2026 Pop. ↓ |
|---|---|---|
| Lewiston | Androscoggin County | 38,911 |
| Lisbon | Androscoggin County | 9,974 |
| Lebanon | York County | 6,835 |
| Lincoln | Penobscot County | 4,982 |
| Lyman | York County | 4,733 |
| Limington | York County | 4,206 |
| Litchfield | Kennebec County | 3,824 |
| Limerick | York County | 3,594 |
| Levant | Penobscot County | 3,357 |
| Livermore Falls | Androscoggin County | 3,289 |
| Lincolnville | Waldo County | 2,449 |
| Leeds | Androscoggin County | 2,444 |
| Livermore | Androscoggin County | 2,255 |
| Lamoine | Hancock County | 1,817 |
| Limestone | Aroostook County | 1,471 |
| Lubec | Washington County | 1,231 |
| Lovell | Oxford County | 1,154 |
| Littleton | Aroostook County | 991 |
| Linneus | Aroostook County | 943 |
| Liberty | Waldo County | 940 |
| Lee | Penobscot County | 921 |
| Lagrange | Penobscot County | 648 |
| Ludlow | Aroostook County | 441 |
| Lowell | Penobscot County | 390 |
| Long Island | Cumberland County | 237 |
| Lake View | Piscataquis County | 151 |
| Lakeville | Penobscot County | 105 |
| Lincoln | Oxford County | 40 |