| Potomac to Rodgau | 4,069.73 mi (6,549.60 km) |
| Potomac to Roding | 4,240.50 mi (6,824.42 km) |
| Potomac to Rodinghausen | 3,990.00 mi (6,421.29 km) |
| Potomac to Roetgen | 3,943.85 mi (6,347.01 km) |
| Potomac to Rommerskirchen | 3,953.09 mi (6,361.89 km) |
| Potomac to Ronnenberg | 4,033.52 mi (6,491.33 km) |
| Potomac to Rosbach vor der Hohe | 4,054.17 mi (6,524.55 km) |
| Potomac to Rosdorf | 4,066.60 mi (6,544.57 km) |
| Potomac to Rosenheim | 4,268.70 mi (6,869.81 km) |
| Potomac to Rosrath | 3,976.43 mi (6,399.45 km) |
| Potomac to Rossdorf | 4,069.24 mi (6,548.81 km) |
| Potomac to Rosstal | 4,168.72 mi (6,708.91 km) |
| Potomac to Rostock | 4,075.89 mi (6,559.51 km) |
| Potomac to Rotenburg an der Fulda | 4,074.59 mi (6,557.42 km) |
| Potomac to Roth | 4,181.87 mi (6,730.07 km) |
