18 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Dover-Foxcroft | Piscataquis County | 4,420 |
| Durham | Androscoggin County | 4,404 |
| Dexter | Penobscot County | 3,868 |
| Dixfield | Oxford County | 2,307 |
| Damariscotta | Lincoln County | 2,303 |
| Dayton | York County | 2,181 |
| Deer Isle | Hancock County | 2,119 |
| Dresden | Lincoln County | 1,796 |
| Dedham | Hancock County | 1,647 |
| Denmark | Oxford County | 1,251 |
| Dixmont | Penobscot County | 1,206 |
| Detroit | Somerset County | 929 |
| Danforth | Washington County | 591 |
| Dennysville | Washington County | 314 |
| Dallas | Franklin County | 312 |
| Dyer Brook | Aroostook County | 215 |
| Deblois | Washington County | 76 |
| Dennistown | Somerset County | 65 |