| South Portland to Carmona | 3,335.03 mi (5,367.21 km) |
| South Portland to Cartagena | 3,552.61 mi (5,717.38 km) |
| South Portland to Cartama | 3,408.73 mi (5,485.81 km) |
| South Portland to Cartaya | 3,268.02 mi (5,259.37 km) |
| South Portland to Caspe | 3,475.82 mi (5,593.80 km) |
| South Portland to Cassa de la Selva | 3,587.23 mi (5,773.09 km) |
| South Portland to Castalla | 3,533.21 mi (5,686.15 km) |
| South Portland to Castellbisbal | 3,560.23 mi (5,729.64 km) |
| South Portland to Castelldefels | 3,566.43 mi (5,739.62 km) |
| South Portland to Castello de Ampurias | 3,584.22 mi (5,768.25 km) |
| South Portland to Castellon de la Plana | 3,516.60 mi (5,659.42 km) |
| South Portland to Castilleja de la Cuesta | 3,317.75 mi (5,339.41 km) |
| South Portland to Catarroja | 3,518.58 mi (5,662.61 km) |
| South Portland to Catral | 3,541.77 mi (5,699.93 km) |
| South Portland to Caudete | 3,514.64 mi (5,656.26 km) |
