| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Rubert Manor | city | Maryland | United States | 39.05 | -76.51 | 98 | |
| Rugby Hall | city | Maryland | United States | 39.04 | -76.53 | 0 | |
| Rugby Hall Estates | city | Maryland | United States | 39.04 | -76.53 | 88 | |
| Ruhl | city | Maryland | United States | 39.71 | -76.73 | 830 | |
| Rum Ridge Estates | city | Maryland | United States | 38.42 | -75.54 | 49 | |
| Rumbley | city | Maryland | United States | 38.09 | -75.86 | 3 | |
| Rundelac Farm | city | Maryland | United States | 38.95 | -76.52 | 6 | |
| Running Brook | city | Maryland | United States | 39.23 | -76.86 | 347 | |
| Running Brook Acres | city | Maryland | United States | 39.23 | -77.26 | 830 | |
| Running Brook Park | city | Maryland | United States | 39.62 | -76.08 | 393 | |
| Runnymeade Estates | city | Maryland | United States | 39.29 | -76.03 | 49 | |
| Runnymeade Summit | city | Maryland | United States | 39.65 | -77.10 | 830 | |
| Rush | city | Maryland | United States | 39.66 | -78.61 | 1000 | |
| Rush Acres | city | Maryland | United States | 38.40 | -75.46 | 82 | |
| Rush Manor | city | Maryland | United States | 39.63 | -76.44 | 830 | |
| Rushville | city | Maryland | United States | 39.07 | -77.33 | 200 | |
| Rustic Acres | city | Maryland | United States | 38.31 | -75.55 | 45 | |
| Rustic Hills | city | Maryland | United States | 38.49 | -76.73 | 98 | |
| Rustic Knolls | city | Maryland | United States | 38.83 | -76.67 | 111 | |
| Rusty Acres | city | Maryland | United States | 39.11 | -76.95 | 830 | |
| Ruthed Estates | city | Maryland | United States | 39.68 | -77.19 | 830 | |
| Rutherford Green | city | Maryland | United States | 39.34 | -76.75 | 830 | |
| Ruthsburg | city | Maryland | United States | 39.00 | -75.96 | 52 | |
| Rutland | city | Maryland | United States | 38.97 | -76.64 | 78 | |
| Rutland Estates | city | Maryland | United States | 38.96 | -76.64 | 134 | |
| Rutledge | city | Maryland | United States | 39.56 | -76.50 | 830 | |
| Ruxton | city | Maryland | United States | 39.40 | -76.64 | 298 | |
| Ruxton Hills | city | Maryland | United States | 39.40 | -76.66 | 347 | |
| Ruxton Ridge | city | Maryland | United States | 39.41 | -76.64 | 360 |