| Gaithersburg to Rockville (Maryland) | 4.70 mi (7.57 km) |
| Gaithersburg to Rockville Centre (New York) | 216.94 mi (349.14 km) |
| Gaithersburg to Rockwall (Texas) | 1,154.06 mi (1,857.28 km) |
| Gaithersburg to Rocky Mount (North Carolina) | 221.14 mi (355.88 km) |
| Gaithersburg to Rocky Point (New York) | 258.17 mi (415.48 km) |
| Gaithersburg to Rocky River (Ohio) | 292.86 mi (471.31 km) |
| Gaithersburg to Roessleville (New York) | 303.92 mi (489.11 km) |
| Gaithersburg to Rogers (Arkansas) | 944.51 mi (1,520.04 km) |
| Gaithersburg to Rogers (Minnesota) | 934.32 mi (1,503.64 km) |
| Gaithersburg to Rohnert Park (California) | 2,425.60 mi (3,903.63 km) |
| Gaithersburg to Rolla (Missouri) | 789.61 mi (1,270.76 km) |
| Gaithersburg to Rolling Meadows (Illinois) | 601.93 mi (968.71 km) |
| Gaithersburg to Roma (Texas) | 1,534.42 mi (2,469.41 km) |
| Gaithersburg to Rome (Georgia) | 554.81 mi (892.88 km) |
| Gaithersburg to Rome (New York) | 296.52 mi (477.20 km) |
