22 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Rockville | Montgomery County | 68,687 |
| Randallstown | Baltimore County | 37,171 |
| Reisterstown | Baltimore County | 28,028 |
| Rosedale | Baltimore County | 20,258 |
| Redland | Montgomery County | 18,622 |
| Rossville | Baltimore County | 15,592 |
| Rosaryville | Charles County | 12,358 |
| Riviera Beach | Anne Arundel County | 11,982 |
| Robinwood | Washington County | 8,273 |
| Riverdale Park | Prince George's County | 7,286 |
| Riverside | Harford County | 5,799 |
| Riva | Anne Arundel County | 4,961 |
| Rising Sun | Cecil County | 2,783 |
| Romancoke | Queen Anne's County | 2,201 |
| Ridgely | Caroline County | 1,654 |
| Rock Hall | Kent County | 1,203 |
| Rawlings | Allegany County | 374 |
| Rosemont | Frederick County | 270 |
| Rohrersville | Washington County | 210 |
| Reid | Washington County | 124 |
| Rock Point | Charles County | 78 |
| Ringgold | Washington County | 57 |