15 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Rockland | Knox County | 7,047 |
| Rumford | Oxford County | 5,911 |
| Raymond | Cumberland County | 4,699 |
| Rockport | Knox County | 3,627 |
| Richmond | Sagadahoc County | 3,566 |
| Readfield | Kennebec County | 2,739 |
| Randolph | Kennebec County | 1,778 |
| Rangeley | Franklin County | 1,348 |
| Rome | Kennebec County | 1,188 |
| Robbinston | Washington County | 553 |
| Ripley | Somerset County | 488 |
| Roxbury | Oxford County | 364 |
| Roque Bluffs | Washington County | 317 |
| Rangeley | Franklin County | 183 |
| Reed | Aroostook County | 125 |