11 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Topsham town | Sagadahoc County | 9,781 |
| Turner town | Androscoggin County | 6,041 |
| Thomaston town | Knox County | 2,708 |
| Trenton town | Hancock County | 1,636 |
| Tremont town | Hancock County | 1,530 |
| Troy town | Waldo County | 1,148 |
| Thorndike town | Waldo County | 817 |
| Temple town | Franklin County | 555 |
| Topsfield town | Washington County | 182 |
| Talmadge town | Washington County | 69 |
| The Forks plantation | Somerset County | 49 |