| South Portland to Cocentaina | 3,539.01 mi (5,695.48 km) |
| South Portland to Coin | 3,404.50 mi (5,479.01 km) |
| South Portland to Colindres | 3,253.30 mi (5,235.68 km) |
| South Portland to Collado-Villalba | 3,310.27 mi (5,327.37 km) |
| South Portland to Colmenar Viejo | 3,320.82 mi (5,344.35 km) |
| South Portland to Colmenarejo | 3,312.12 mi (5,330.35 km) |
| South Portland to Conil de la Frontera | 3,353.73 mi (5,397.31 km) |
| South Portland to Consuegra | 3,366.27 mi (5,417.48 km) |
| South Portland to Corbera de Llobregat | 3,559.87 mi (5,729.06 km) |
| South Portland to Cordoba | 3,362.09 mi (5,410.77 km) |
| South Portland to Coria del Rio | 3,321.08 mi (5,344.76 km) |
| South Portland to Crevillente | 3,538.54 mi (5,694.73 km) |
| South Portland to Cuarte de Huerva | 3,424.05 mi (5,510.48 km) |
| South Portland to Cubellas | 3,554.88 mi (5,721.03 km) |
| South Portland to Cuellar | 3,272.44 mi (5,266.49 km) |
