| Piqua to Ratingen | 4,172.54 mi (6,715.05 km) |
| Piqua to Ratzeburg | 4,235.21 mi (6,815.91 km) |
| Piqua to Raubling | 4,499.04 mi (7,240.51 km) |
| Piqua to Rauenberg | 4,312.93 mi (6,940.98 km) |
| Piqua to Raunheim | 4,277.02 mi (6,883.20 km) |
| Piqua to Ravensburg | 4,401.52 mi (7,083.57 km) |
| Piqua to Recke | 4,169.89 mi (6,710.80 km) |
| Piqua to Recklinghausen | 4,174.94 mi (6,718.92 km) |
| Piqua to Regen | 4,493.95 mi (7,232.32 km) |
| Piqua to Regensburg | 4,452.13 mi (7,165.01 km) |
| Piqua to Regenstauf | 4,449.86 mi (7,161.36 km) |
| Piqua to Rehau | 4,404.00 mi (7,087.55 km) |
| Piqua to Rehburg-Loccum | 4,222.12 mi (6,794.84 km) |
| Piqua to Rehlingen-Siersburg | 4,230.41 mi (6,808.20 km) |
| Piqua to Reichelsheim | 4,302.51 mi (6,924.22 km) |
