| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Rosaryville | city | Maryland | United States | 38.76 | -76.81 | 200 | |
| Rosaryville Estates | city | Maryland | United States | 38.76 | -76.81 | 200 | |
| Rose Haven | city | Maryland | United States | 38.73 | -76.54 | 3 | |
| Rose Hill | city | Maryland | United States | 38.56 | -76.57 | 114 | |
| Rose Hill Estates | city | Maryland | United States | 39.01 | -77.16 | 209 | |
| Rose Mary Estates | city | Maryland | United States | 39.28 | -76.96 | 830 | |
| Rosecroft | city | Maryland | United States | 38.16 | -76.44 | 3 | |
| Rosecroft Park | city | Maryland | United States | 38.80 | -76.97 | 121 | |
| Rosedale | city | Maryland | United States | 39.32 | -76.52 | 39 | |
| Rosedale | city | Maryland | United States | 39.43 | -77.42 | 305 | |
| Rosedale Park | city | Maryland | United States | 38.99 | -77.09 | 308 | |
| Rosedale Park | city | Maryland | United States | 39.03 | -76.90 | 91 | |
| Rosedale Terrace | city | Maryland | United States | 39.31 | -76.51 | 68 | |
| Rosemary Hills | city | Maryland | United States | 39.00 | -77.04 | 301 | |
| Rosemont | city | Maryland | United States | 39.24 | -76.63 | 49 | |
| Rosemont | city | Maryland | United States | 39.33 | -77.62 | 830 | |
| Rosemont | city | Maryland | United States | 39.14 | -76.87 | 347 | |
| Rosemont | city | Maryland | United States | 39.13 | -77.19 | 830 | |
| Roseville Heights | city | Maryland | United States | 39.61 | -76.92 | 846 | |
| Rosewick | city | Maryland | United States | 38.56 | -76.98 | 200 | |
| Rosewood | city | Maryland | United States | 38.52 | -76.54 | 111 | |
| Rosewood Estates | city | Maryland | United States | 39.19 | -77.15 | 830 | |
| Rosewood Forest | city | Maryland | United States | 38.41 | -75.52 | 55 | |
| Roslyn | city | Maryland | United States | 39.37 | -76.74 | 830 | |
| Roslyn Station | city | Maryland | United States | 39.38 | -76.74 | 830 | |
| Ross Acres | city | Maryland | United States | 38.58 | -76.24 | 3 | |
| Ross Cove | city | Maryland | United States | 39.09 | -76.51 | 3 | |
| Ross Farm Woods | city | Maryland | United States | 38.83 | -75.92 | 22 | |
| Ross Run Estates | city | Maryland | United States | 39.64 | -76.93 | 931 | |
| Ross Valley Farms | city | Maryland | United States | 39.57 | -76.66 | 830 | |
| Ross Woods | city | Maryland | United States | 38.45 | -76.55 | 52 | |
| Rossmoor | city | Maryland | United States | 39.10 | -77.07 | 830 | |
| Rossville | city | Maryland | United States | 39.34 | -76.48 | 49 | |
| Rosswood Estates | city | Maryland | United States | 39.50 | -77.27 | 830 | |
| Rosswood Estates | city | Maryland | United States | 39.37 | -77.24 | 830 |