| South Portland to Celano | 4,053.29 mi (6,523.15 km) |
| South Portland to Cento | 3,860.64 mi (6,213.10 km) |
| South Portland to Cepagatti | 4,064.79 mi (6,541.65 km) |
| South Portland to Ceprano | 4,071.56 mi (6,552.54 km) |
| South Portland to Cercola | 4,133.65 mi (6,652.47 km) |
| South Portland to Cerea | 3,841.71 mi (6,182.63 km) |
| South Portland to Cerese | 3,827.10 mi (6,159.12 km) |
| South Portland to Cerignola | 4,185.42 mi (6,735.79 km) |
| South Portland to Cermenate | 3,734.58 mi (6,010.22 km) |
| South Portland to Cernusco sul Naviglio | 3,751.25 mi (6,037.06 km) |
| South Portland to Cerreto Guidi | 3,877.27 mi (6,239.86 km) |
| South Portland to Cerro Maggiore | 3,732.22 mi (6,006.43 km) |
| South Portland to Certaldo | 3,891.76 mi (6,263.17 km) |
| South Portland to Cerveteri | 3,993.27 mi (6,426.55 km) |
| South Portland to Cervia | 3,922.83 mi (6,313.18 km) |
