| South Portland to Cromer | 3,212.90 mi (5,170.67 km) |
| South Portland to Crosby | 3,030.15 mi (4,876.56 km) |
| South Portland to Crowborough | 3,209.73 mi (5,165.56 km) |
| South Portland to Croxley Green | 3,171.66 mi (5,104.30 km) |
| South Portland to Croydon | 3,191.49 mi (5,136.20 km) |
| South Portland to Cudworth | 3,092.34 mi (4,976.63 km) |
| South Portland to Culcheth | 3,051.11 mi (4,910.28 km) |
| South Portland to Cullercoats | 3,064.32 mi (4,931.55 km) |
| South Portland to Cumbernauld | 2,952.00 mi (4,750.78 km) |
| South Portland to Cumnock | 2,949.12 mi (4,746.15 km) |
| South Portland to Cupar | 2,983.37 mi (4,801.27 km) |
| South Portland to Cwmbran | 3,066.59 mi (4,935.20 km) |
| South Portland to Dagenham | 3,197.91 mi (5,146.53 km) |
| South Portland to Dalkeith | 2,988.08 mi (4,808.86 km) |
| South Portland to Darfield | 3,094.45 mi (4,980.04 km) |
