22 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Rockville | Montgomery County | 68,687 |
| Randallstown | Baltimore County | 36,520 |
| Reisterstown | Baltimore County | 28,040 |
| Rosedale | Baltimore County | 21,089 |
| Redland | Montgomery County | 19,243 |
| Rossville | Baltimore County | 15,079 |
| Riviera Beach | Anne Arundel County | 12,597 |
| Rosaryville | Charles County | 12,438 |
| Robinwood | Washington County | 7,961 |
| Riverdale Park | Prince George's County | 7,286 |
| Riverside | Harford County | 6,107 |
| Riva | Anne Arundel County | 4,909 |
| Rising Sun | Cecil County | 2,783 |
| Romancoke | Queen Anne's County | 1,967 |
| Ridgely | Caroline County | 1,654 |
| Rock Hall | Kent County | 1,203 |
| Rawlings | Allegany County | 360 |
| Rosemont | Frederick County | 270 |
| Rock Point | Charles County | 172 |
| Rohrersville | Washington County | 136 |
| Reid | Washington County | 117 |
| Ringgold | Washington County | 68 |