| South Portland to Busto Arsizio | 3,727.65 mi (5,999.07 km) |
| South Portland to Busto Garolfo | 3,731.25 mi (6,004.87 km) |
| South Portland to Cabras | 3,910.59 mi (6,293.49 km) |
| South Portland to Cadelbosco di Sopra | 3,830.44 mi (6,164.49 km) |
| South Portland to Cadoneghe | 3,863.27 mi (6,217.32 km) |
| South Portland to Cagli | 3,960.69 mi (6,374.12 km) |
| South Portland to Cagliari | 3,962.53 mi (6,377.08 km) |
| South Portland to Cairo Montenotte | 3,742.80 mi (6,023.46 km) |
| South Portland to Caivano | 4,128.30 mi (6,643.86 km) |
| South Portland to Calcinaia | 3,868.71 mi (6,226.10 km) |
| South Portland to Calcinato | 3,799.02 mi (6,113.93 km) |
| South Portland to Calderara di Reno | 3,865.72 mi (6,221.27 km) |
| South Portland to Caldogno | 3,839.68 mi (6,179.37 km) |
| South Portland to Calenzano | 3,885.92 mi (6,253.79 km) |
| South Portland to Calolziocorte | 3,746.10 mi (6,028.76 km) |
