| City Name | County | Zip Code |
| Rabbit Town | Dorchester | 21869 |
| Randalia | Cecil | 21915 |
| Randallstown | Baltimore | 21133 |
| Rawlings | Allegany | 21557 |
| Rayville | Baltimore | 21120 |
| Rehobeth | Somerset | 21857 |
| Reisterstown | Baltimore | 21136 |
| Rhodesdale | Dorchester | 21659 |
| Ridge | Saint Mary's | 20680 |
| Ridgely | Caroline | ***** |
| Ringgold | Washington | 21783 |
| Rising Sun | Cecil | 21911 |
| Rison | Charles | 20658 |
| Riva | Anne Arundel | 21140 |
| Riverdale | Prince George's | ***** |
| Riverside | Charles | ***** |
| Riviera Beach | Anne Arundel | 21122 |
| Rock Hall | Kent | 21661 |
| Rock Point | Charles | 20682 |
| Rock Springs | Cecil | 21911 |
| Rockdale | Baltimore | 21244 |
| Rocks | Harford | 21154 |
| Rockville | Montgomery | ***** |
| Rocky Ridge | Frederick | 21778 |
| Rohrersville | Washington | 21779 |
| Rosedale | Baltimore | 21237 |
| Royal Oak | Talbot | 21662 |
| Rumbley | Somerset | 21871 |
| Ruxton | Baltimore | 21204 |
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