| Potomac to Rochefort | 3,764.40 mi (6,058.21 km) |
| Potomac to Rodez | 3,966.10 mi (6,382.82 km) |
| Potomac to Rognac | 4,111.10 mi (6,616.18 km) |
| Potomac to Roissy-en-Brie | 3,847.05 mi (6,191.23 km) |
| Potomac to Romainville | 3,835.48 mi (6,172.62 km) |
| Potomac to Romans-sur-Isere | 4,055.59 mi (6,526.84 km) |
| Potomac to Rombas | 3,978.20 mi (6,402.29 km) |
| Potomac to Romilly-sur-Seine | 3,899.64 mi (6,275.86 km) |
| Potomac to Ronchin | 3,818.75 mi (6,145.69 km) |
| Potomac to Roncq | 3,816.35 mi (6,141.83 km) |
| Potomac to Roquebrune-sur-Argens | 4,175.30 mi (6,719.50 km) |
| Potomac to Roquevaire | 4,132.10 mi (6,649.97 km) |
| Potomac to Rosny-sous-Bois | 3,837.97 mi (6,176.61 km) |
| Potomac to Roubaix | 3,820.45 mi (6,148.42 km) |
| Potomac to Rouen | 3,764.76 mi (6,058.79 km) |
