| South Portland to Corato | 4,211.46 mi (6,777.69 km) |
| South Portland to Corbetta | 3,735.20 mi (6,011.23 km) |
| South Portland to Corciano | 3,960.00 mi (6,373.00 km) |
| South Portland to Cordenons | 3,876.84 mi (6,239.17 km) |
| South Portland to Cori | 4,041.77 mi (6,504.60 km) |
| South Portland to Coriano | 3,943.61 mi (6,346.62 km) |
| South Portland to Corigliano Calabro | 4,277.37 mi (6,883.77 km) |
| South Portland to Corleone | 4,205.17 mi (6,767.57 km) |
| South Portland to Cormano | 3,743.07 mi (6,023.90 km) |
| South Portland to Cornaredo | 3,739.06 mi (6,017.44 km) |
| South Portland to Cornate d'Adda | 3,752.48 mi (6,039.04 km) |
| South Portland to Cornedo Vicentino | 3,833.04 mi (6,168.69 km) |
| South Portland to Correggio | 3,838.07 mi (6,176.77 km) |
| South Portland to Corridonia | 4,008.60 mi (6,451.22 km) |
| South Portland to Corsico | 3,744.82 mi (6,026.70 km) |
