| South Portland to Cockermouth | 2,996.53 mi (4,822.45 km) |
| South Portland to Colchester | 3,220.54 mi (5,182.97 km) |
| South Portland to Coleford | 3,080.27 mi (4,957.21 km) |
| South Portland to Colne | 3,057.14 mi (4,920.00 km) |
| South Portland to Colwyn Bay | 3,007.33 mi (4,839.84 km) |
| South Portland to Congleton | 3,068.76 mi (4,938.69 km) |
| South Portland to Conisbrough | 3,101.69 mi (4,991.69 km) |
| South Portland to Connahs Quay | 3,034.27 mi (4,883.19 km) |
| South Portland to Consett | 3,052.38 mi (4,912.33 km) |
| South Portland to Conwy | 3,002.34 mi (4,831.79 km) |
| South Portland to Cookstown | 2,865.01 mi (4,610.79 km) |
| South Portland to Corby | 3,142.97 mi (5,058.12 km) |
| South Portland to Corfe Mullen | 3,126.81 mi (5,032.12 km) |
| South Portland to Corsham | 3,105.41 mi (4,997.68 km) |
| South Portland to Coseley | 3,086.28 mi (4,966.88 km) |
