| Gaithersburg to Romeoville (Illinois) | 597.90 mi (962.22 km) |
| Gaithersburg to Romulus (Michigan) | 386.49 mi (622.00 km) |
| Gaithersburg to Ronkonkoma (New York) | 245.26 mi (394.70 km) |
| Gaithersburg to Roosevelt (New York) | 219.97 mi (354.01 km) |
| Gaithersburg to Rosamond (California) | 2,262.37 mi (3,640.93 km) |
| Gaithersburg to Rosaryville (Maryland) | 32.80 mi (52.78 km) |
| Gaithersburg to Roscoe (Illinois) | 656.98 mi (1,057.31 km) |
| Gaithersburg to Rose Hill (Virginia) | 24.65 mi (39.67 km) |
| Gaithersburg to Roseburg (Oregon) | 2,385.42 mi (3,838.96 km) |
| Gaithersburg to Rosedale (California) | 2,303.07 mi (3,706.43 km) |
| Gaithersburg to Rosedale (Maryland) | 39.98 mi (64.34 km) |
| Gaithersburg to Roselle (Illinois) | 603.17 mi (970.71 km) |
| Gaithersburg to Roselle (New Jersey) | 188.42 mi (303.24 km) |
| Gaithersburg to Roselle Park (New Jersey) | 188.60 mi (303.53 km) |
| Gaithersburg to Rosemead (California) | 2,274.42 mi (3,660.33 km) |
