| Piqua to Rheinbach | 4,198.46 mi (6,756.76 km) |
| Piqua to Rheinberg | 4,154.99 mi (6,686.81 km) |
| Piqua to Rheine | 4,162.14 mi (6,698.31 km) |
| Piqua to Rheinfelden (Baden) | 4,337.10 mi (6,979.90 km) |
| Piqua to Ribnitz-Damgarten | 4,276.41 mi (6,882.21 km) |
| Piqua to Richterich | 4,158.57 mi (6,692.57 km) |
| Piqua to Riedlingen | 4,382.59 mi (7,053.09 km) |
| Piqua to Riegelsberg | 4,243.09 mi (6,828.60 km) |
| Piqua to Rielasingen-Worblingen | 4,372.73 mi (7,037.23 km) |
| Piqua to Riesa | 4,412.17 mi (7,100.70 km) |
| Piqua to Rietberg | 4,215.46 mi (6,784.13 km) |
| Piqua to Rinteln | 4,226.29 mi (6,801.56 km) |
| Piqua to Ritterhude | 4,181.03 mi (6,728.71 km) |
| Piqua to Rodenbach | 4,294.74 mi (6,911.71 km) |
| Piqua to Rodental | 4,367.12 mi (7,028.21 km) |
