| South Portland to Ratingen | 3,473.00 mi (5,589.25 km) |
| South Portland to Ratzeburg | 3,556.66 mi (5,723.89 km) |
| South Portland to Raubling | 3,791.15 mi (6,101.27 km) |
| South Portland to Rauenberg | 3,605.99 mi (5,803.28 km) |
| South Portland to Raunheim | 3,573.40 mi (5,750.83 km) |
| South Portland to Ravensburg | 3,689.17 mi (5,937.14 km) |
| South Portland to Recke | 3,477.87 mi (5,597.10 km) |
| South Portland to Recklinghausen | 3,477.50 mi (5,596.50 km) |
| South Portland to Regen | 3,793.63 mi (6,105.25 km) |
| South Portland to Regensburg | 3,750.04 mi (6,035.11 km) |
| South Portland to Regenstauf | 3,748.39 mi (6,032.45 km) |
| South Portland to Rehau | 3,708.06 mi (5,967.54 km) |
| South Portland to Rehburg-Loccum | 3,533.18 mi (5,686.11 km) |
| South Portland to Rehlingen-Siersburg | 3,520.59 mi (5,665.85 km) |
| South Portland to Reichelsheim | 3,598.03 mi (5,790.48 km) |
