15 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Rockland | Knox County | 7,034 |
| Rumford | Oxford County | 5,855 |
| Raymond | Cumberland County | 4,736 |
| Rockport | Knox County | 3,601 |
| Richmond | Sagadahoc County | 3,559 |
| Readfield | Kennebec County | 2,769 |
| Randolph | Kennebec County | 1,783 |
| Rangeley | Franklin County | 1,374 |
| Rome | Kennebec County | 1,197 |
| Robbinston | Washington County | 553 |
| Ripley | Somerset County | 491 |
| Roxbury | Oxford County | 362 |
| Roque Bluffs | Washington County | 321 |
| Rangeley | Franklin County | 183 |
| Reed | Aroostook County | 125 |