| Potomac to Ratingen | 3,952.19 mi (6,360.43 km) |
| Potomac to Ratzeburg | 4,035.72 mi (6,494.86 km) |
| Potomac to Raubling | 4,269.55 mi (6,871.17 km) |
| Potomac to Rauenberg | 4,084.57 mi (6,573.47 km) |
| Potomac to Raunheim | 4,052.30 mi (6,521.54 km) |
| Potomac to Ravensburg | 4,166.99 mi (6,706.13 km) |
| Potomac to Recke | 3,957.27 mi (6,368.62 km) |
| Potomac to Recklinghausen | 3,956.79 mi (6,367.83 km) |
| Potomac to Regen | 4,272.70 mi (6,876.25 km) |
| Potomac to Regensburg | 4,229.01 mi (6,805.93 km) |
| Potomac to Regenstauf | 4,227.40 mi (6,803.34 km) |
| Potomac to Rehau | 4,187.36 mi (6,738.90 km) |
| Potomac to Rehburg-Loccum | 4,012.58 mi (6,457.62 km) |
| Potomac to Rehlingen-Siersburg | 3,998.86 mi (6,435.54 km) |
| Potomac to Reichelsheim | 4,076.85 mi (6,561.06 km) |
