18 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Durham | Androscoggin County | 4,453 |
| Dover-Foxcroft | Piscataquis County | 4,340 |
| Dexter | Penobscot County | 3,887 |
| Dixfield | Oxford County | 2,302 |
| Damariscotta | Lincoln County | 2,299 |
| Dayton | York County | 2,174 |
| Deer Isle | Hancock County | 2,105 |
| Dresden | Lincoln County | 1,798 |
| Dedham | Hancock County | 1,636 |
| Denmark | Oxford County | 1,260 |
| Dixmont | Penobscot County | 1,202 |
| Detroit | Somerset County | 937 |
| Danforth | Washington County | 590 |
| Dennysville | Washington County | 314 |
| Dallas | Franklin County | 312 |
| Dyer Brook | Aroostook County | 216 |
| Deblois | Washington County | 76 |
| Dennistown | Somerset County | 67 |