| Gaithersburg to Reichenbach/Vogtland | 4,182.05 mi (6,730.35 km) |
| Gaithersburg to Reinbek | 4,017.11 mi (6,464.92 km) |
| Gaithersburg to Reinfeld | 4,016.72 mi (6,464.28 km) |
| Gaithersburg to Reinheim | 4,068.46 mi (6,547.55 km) |
| Gaithersburg to Reiskirchen | 4,045.89 mi (6,511.22 km) |
| Gaithersburg to Rellingen | 3,996.97 mi (6,432.51 km) |
| Gaithersburg to Remagen | 3,982.49 mi (6,409.19 km) |
| Gaithersburg to Remscheid | 3,964.43 mi (6,380.14 km) |
| Gaithersburg to Rendsburg | 3,973.43 mi (6,394.62 km) |
| Gaithersburg to Renningen | 4,104.40 mi (6,605.40 km) |
| Gaithersburg to Reutlingen | 4,124.57 mi (6,637.85 km) |
| Gaithersburg to Rhaude | 3,924.33 mi (6,315.59 km) |
| Gaithersburg to Rheda-Wiedenbruck | 3,989.44 mi (6,420.38 km) |
| Gaithersburg to Rhede | 3,926.99 mi (6,319.88 km) |
| Gaithersburg to Rheinau | 4,066.27 mi (6,544.03 km) |
