| South Portland to Castelfidardo | 4,002.03 mi (6,440.65 km) |
| South Portland to Castelfiorentino | 3,886.71 mi (6,255.06 km) |
| South Portland to Castelfranco di Sopra | 3,911.31 mi (6,294.64 km) |
| South Portland to Castelfranco di Sotto | 3,873.87 mi (6,234.39 km) |
| South Portland to Castelfranco Emilia | 3,855.58 mi (6,204.95 km) |
| South Portland to Castelfranco Veneto | 3,855.79 mi (6,205.29 km) |
| South Portland to Castellabate | 4,182.53 mi (6,731.14 km) |
| South Portland to Castellammare del Golfo | 4,178.12 mi (6,724.04 km) |
| South Portland to Castellammare di Stabia | 4,145.91 mi (6,672.19 km) |
| South Portland to Castellamonte | 3,686.56 mi (5,932.94 km) |
| South Portland to Castellana Grotte | 4,254.84 mi (6,847.51 km) |
| South Portland to Castellaneta | 4,254.64 mi (6,847.17 km) |
| South Portland to Castellanza | 3,729.54 mi (6,002.12 km) |
| South Portland to Castellarano | 3,845.13 mi (6,188.15 km) |
| South Portland to Castelleone | 3,776.79 mi (6,078.15 km) |
