| Piqua to Rodgau | 4,293.65 mi (6,909.96 km) |
| Piqua to Roding | 4,461.77 mi (7,180.53 km) |
| Piqua to Rodinghausen | 4,201.97 mi (6,762.41 km) |
| Piqua to Roetgen | 4,169.06 mi (6,709.46 km) |
| Piqua to Rommerskirchen | 4,175.24 mi (6,719.40 km) |
| Piqua to Ronnenberg | 4,243.02 mi (6,828.48 km) |
| Piqua to Rosbach vor der Hohe | 4,276.86 mi (6,882.94 km) |
| Piqua to Rosdorf | 4,280.34 mi (6,888.54 km) |
| Piqua to Rosenheim | 4,497.81 mi (7,238.53 km) |
| Piqua to Rosrath | 4,198.49 mi (6,756.81 km) |
| Piqua to Rossdorf | 4,294.27 mi (6,910.96 km) |
| Piqua to Rosstal | 4,392.18 mi (7,068.53 km) |
| Piqua to Rostock | 4,270.65 mi (6,872.94 km) |
| Piqua to Rotenburg an der Fulda | 4,291.48 mi (6,906.48 km) |
| Piqua to Roth | 4,405.74 mi (7,090.36 km) |
