| South Portland to Clacton-on-Sea | 3,232.62 mi (5,202.40 km) |
| South Portland to Clay Cross | 3,100.64 mi (4,990.00 km) |
| South Portland to Clayton | 3,072.74 mi (4,945.09 km) |
| South Portland to Clayton le Moors | 3,050.46 mi (4,909.25 km) |
| South Portland to Cleckheaton | 3,077.54 mi (4,952.82 km) |
| South Portland to Cleethorpes | 3,147.54 mi (5,065.47 km) |
| South Portland to Clevedon | 3,077.90 mi (4,953.41 km) |
| South Portland to Clifton | 3,115.28 mi (5,013.56 km) |
| South Portland to Clifton | 3,097.08 mi (4,984.26 km) |
| South Portland to Cliftonville | 3,252.59 mi (5,234.53 km) |
| South Portland to Clitheroe | 3,048.38 mi (4,905.89 km) |
| South Portland to Clydebank | 2,937.28 mi (4,727.10 km) |
| South Portland to Coalville | 3,111.32 mi (5,007.19 km) |
| South Portland to Coatbridge | 2,951.99 mi (4,750.77 km) |
| South Portland to Cobham | 3,180.30 mi (5,118.20 km) |
