| South Portland to Brezovica | 3,946.58 mi (6,351.40 km) |
| South Portland to Cankova | 3,986.98 mi (6,416.43 km) |
| South Portland to Celje | 3,973.78 mi (6,395.18 km) |
| South Portland to Cerklje na Gorenjskem | 3,941.28 mi (6,342.88 km) |
| South Portland to Cerknica | 3,952.08 mi (6,360.26 km) |
| South Portland to Cerkno | 3,925.22 mi (6,317.03 km) |
| South Portland to Cerkvenjak | 3,989.45 mi (6,420.40 km) |
| South Portland to Cirkulane | 3,999.54 mi (6,436.63 km) |
| South Portland to Crensovci | 4,003.35 mi (6,442.77 km) |
| South Portland to Crna na Koroskem | 3,948.35 mi (6,354.25 km) |
| South Portland to Crnomelj | 3,994.44 mi (6,428.44 km) |
| South Portland to Destrnik | 3,989.55 mi (6,420.56 km) |
| South Portland to Divaca | 3,940.10 mi (6,340.97 km) |
| South Portland to Dobje | 3,982.52 mi (6,409.24 km) |
| South Portland to Dobrna | 3,968.56 mi (6,386.78 km) |
