| Gaithersburg to Ratingen | 3,947.34 mi (6,352.62 km) |
| Gaithersburg to Ratzeburg | 4,030.43 mi (6,486.36 km) |
| Gaithersburg to Raubling | 4,264.93 mi (6,863.74 km) |
| Gaithersburg to Rauenberg | 4,079.91 mi (6,565.97 km) |
| Gaithersburg to Raunheim | 4,047.55 mi (6,513.90 km) |
| Gaithersburg to Ravensburg | 4,162.49 mi (6,698.87 km) |
| Gaithersburg to Recke | 3,952.25 mi (6,360.54 km) |
| Gaithersburg to Recklinghausen | 3,951.89 mi (6,359.95 km) |
| Gaithersburg to Regen | 4,267.90 mi (6,868.52 km) |
| Gaithersburg to Regensburg | 4,224.24 mi (6,798.26 km) |
| Gaithersburg to Regenstauf | 4,222.62 mi (6,795.65 km) |
| Gaithersburg to Rehau | 4,182.45 mi (6,731.00 km) |
| Gaithersburg to Rehburg-Loccum | 4,007.50 mi (6,449.44 km) |
| Gaithersburg to Rehlingen-Siersburg | 3,994.27 mi (6,428.15 km) |
| Gaithersburg to Reichelsheim | 4,072.13 mi (6,553.46 km) |
