| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Rabbit Run | city | Maryland | United States | 39.57 | -77.20 | 830 | |
| Rabbit Town | city | Maryland | United States | 38.49 | -75.83 | 3 | |
| Radcliffe | city | Maryland | United States | 38.61 | -76.61 | 141 | |
| Radcliffe Estates | city | Maryland | United States | 38.51 | -76.96 | 114 | |
| Radiant Valley | city | Maryland | United States | 38.94 | -76.89 | 55 | |
| Rainbow Estates | city | Maryland | United States | 39.37 | -77.06 | 830 | |
| Raintree | city | Maryland | United States | 39.04 | -76.50 | 98 | |
| Raintree Estates | city | Maryland | United States | 39.20 | -77.00 | 830 | |
| Ralph | city | Maryland | United States | 38.51 | -75.83 | 16 | |
| Ralston | city | Maryland | United States | 39.37 | -76.73 | 830 | |
| Ramblewood | city | Maryland | United States | 39.36 | -76.59 | 278 | |
| Ramona Beach | city | Maryland | United States | 39.23 | -76.40 | 0 | |
| Ramsgate Estates | city | Maryland | United States | 39.53 | -76.17 | 180 | |
| Ramsgate News (not official) | city | Maryland | United States | 39.24 | -76.71 | 180 | |
| Ranchleigh | city | Maryland | United States | 39.38 | -76.67 | 387 | |
| Randalia | city | Maryland | United States | 39.52 | -75.87 | 16 | |
| Randall Ridge | city | Maryland | United States | 39.37 | -76.80 | 830 | |
| Randallstown | city | Maryland | United States | 39.37 | -76.80 | 830 | |
| Randle Cliff Beach | city | Maryland | United States | 38.67 | -76.53 | 75 | |
| Randolph Hills | city | Maryland | United States | 39.05 | -77.09 | 249 | |
| Randolph Village | city | Maryland | United States | 38.89 | -76.86 | 160 | |
| Random Heights | city | Maryland | United States | 39.61 | -76.94 | 948 | |
| Rangers Woods | city | Maryland | United States | 39.29 | -77.32 | 830 | |
| Rarjem Acres | city | Maryland | United States | 39.71 | -76.91 | 967 | |
| Rattle Ridge | city | Maryland | United States | 39.34 | -77.21 | 830 | |
| Raven Run | city | Maryland | United States | 39.58 | -76.91 | 830 | |
| Ravenhurst | city | Maryland | United States | 39.48 | -76.53 | 830 | |
| Ravenshead | city | Maryland | United States | 38.58 | -76.61 | 42 | |
| Ravenshead | city | Maryland | United States | 39.03 | -76.55 | 88 | |
| Ravenwood Estates | city | Maryland | United States | 39.40 | -77.19 | 830 | |
| Rawlings | city | Maryland | United States | 39.53 | -78.88 | 830 | |
| Rawlings Heights | city | Maryland | United States | 39.54 | -78.89 | 830 | |
| Ray Park Heights | city | Maryland | United States | 38.37 | -75.63 | 19 | |
| Ray-Mar Estates | city | Maryland | United States | 39.46 | -77.04 | 830 | |
| Raydan Retreat | city | Maryland | United States | 39.44 | -77.06 | 830 | |
| Raynor Heights | city | Maryland | United States | 39.23 | -76.66 | 55 | |
| Rays Point | city | Maryland | United States | 38.76 | -76.22 | 3 | |
| Rayville | city | Maryland | United States | 39.65 | -76.70 | 830 |