22 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Rockville | Montgomery County | 68,957 |
| Randallstown | Baltimore County | 36,793 |
| Reisterstown | Baltimore County | 28,178 |
| Rosedale | Baltimore County | 21,211 |
| Redland | Montgomery County | 19,376 |
| Rossville | Baltimore County | 15,074 |
| Riviera Beach | Anne Arundel County | 12,592 |
| Rosaryville | Charles County | 12,554 |
| Robinwood | Washington County | 8,031 |
| Riverdale Park | Prince George's County | 7,277 |
| Riverside | Harford County | 6,085 |
| Riva | Anne Arundel County | 4,965 |
| Rising Sun | Cecil County | 2,789 |
| Romancoke | Queen Anne's County | 2,098 |
| Ridgely | Caroline County | 1,663 |
| Rock Hall | Kent County | 1,206 |
| Rawlings | Allegany County | 337 |
| Rosemont | Frederick County | 271 |
| Rock Point | Charles County | 176 |
| Rohrersville | Washington County | 133 |
| Reid | Washington County | 124 |
| Ringgold | Washington County | 61 |