| City | County | 2026 Pop. ↓ |
|---|---|---|
| Durham | Androscoggin County | 4,451 |
| Dover-Foxcroft | Piscataquis County | 4,422 |
| Dexter | Penobscot County | 3,876 |
| Dixfield | Oxford County | 2,485 |
| Damariscotta | Lincoln County | 2,286 |
| Dayton | York County | 2,182 |
| Deer Isle | Hancock County | 2,123 |
| Dresden | Lincoln County | 1,793 |
| Dedham | Hancock County | 1,680 |
| Denmark | Oxford County | 1,265 |
| Dixmont | Penobscot County | 1,213 |
| Detroit | Somerset County | 933 |
| Danforth | Washington County | 578 |
| Dallas | Franklin County | 311 |
| Dennysville | Washington County | 311 |
| Dyer Brook | Aroostook County | 209 |
| Deblois | Washington County | 76 |
| Dennistown | Somerset County | 60 |