15 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Rockland | Knox County | 7,087 |
| Rumford | Oxford County | 5,999 |
| Raymond | Cumberland County | 4,609 |
| Rockport | Knox County | 3,614 |
| Richmond | Sagadahoc County | 3,566 |
| Readfield | Kennebec County | 2,701 |
| Randolph | Kennebec County | 1,772 |
| Rangeley | Franklin County | 1,354 |
| Rome | Kennebec County | 1,187 |
| Robbinston | Washington County | 553 |
| Ripley | Somerset County | 482 |
| Roxbury | Oxford County | 371 |
| Roque Bluffs | Washington County | 322 |
| Rangeley | Franklin County | 182 |
| Reed | Aroostook County | 129 |