| South Portland to Recica | 3,956.51 mi (6,367.39 km) |
| South Portland to Ribnica | 3,969.48 mi (6,388.26 km) |
| South Portland to Ribnica | 3,963.26 mi (6,378.25 km) |
| South Portland to Rogaska Slatina | 3,989.08 mi (6,419.80 km) |
| South Portland to Rogasovci | 3,984.56 mi (6,412.54 km) |
| South Portland to Rogatec | 3,992.07 mi (6,424.61 km) |
| South Portland to Ruse | 3,973.06 mi (6,394.03 km) |
| South Portland to Salovci | 3,994.51 mi (6,428.54 km) |
| South Portland to Selnica ob Dravi | 3,971.76 mi (6,391.94 km) |
| South Portland to Semic | 3,990.99 mi (6,422.88 km) |
| South Portland to Sempeter pri Gorici | 3,917.64 mi (6,304.83 km) |
| South Portland to Sencur | 3,938.72 mi (6,338.76 km) |
| South Portland to Sentilj | 3,973.34 mi (6,394.47 km) |
| South Portland to Sentjernej | 3,990.84 mi (6,422.64 km) |
| South Portland to Sentjur | 3,979.68 mi (6,404.68 km) |
