| South Portland to Castelletto sopra Ticino | 3,714.93 mi (5,978.60 km) |
| South Portland to Castelli Calepio | 3,771.37 mi (6,069.44 km) |
| South Portland to Castelnovo ne' Monti | 3,833.37 mi (6,169.21 km) |
| South Portland to Castelnuovo Berardenga | 3,918.81 mi (6,306.71 km) |
| South Portland to Castelnuovo di Porto | 4,005.77 mi (6,446.67 km) |
| South Portland to Castelnuovo di Verona | 3,814.73 mi (6,139.22 km) |
| South Portland to Castelnuovo Rangone | 3,852.11 mi (6,199.36 km) |
| South Portland to Castelvetrano | 4,187.57 mi (6,739.24 km) |
| South Portland to Castelvetro di Modena | 3,854.55 mi (6,203.30 km) |
| South Portland to Castenaso | 3,876.38 mi (6,238.43 km) |
| South Portland to Castenedolo | 3,793.62 mi (6,105.24 km) |
| South Portland to Castiglion Fiorentino | 3,936.76 mi (6,335.61 km) |
| South Portland to Castiglione del Lago | 3,949.67 mi (6,356.39 km) |
| South Portland to Castiglione delle Stiviere | 3,804.60 mi (6,122.91 km) |
| South Portland to Castrolibero | 4,274.76 mi (6,879.56 km) |
