| Swansea to Clacton-on-Sea | 4,235.78 mi (6,816.82 km) |
| Swansea to Clay Cross | 4,097.61 mi (6,594.47 km) |
| Swansea to Clayton | 4,065.01 mi (6,542.00 km) |
| Swansea to Clayton le Moors | 4,043.89 mi (6,508.02 km) |
| Swansea to Cleckheaton | 4,070.14 mi (6,550.25 km) |
| Swansea to Cleethorpes | 4,138.27 mi (6,659.89 km) |
| Swansea to Clevedon | 4,091.90 mi (6,585.28 km) |
| Swansea to Clifton | 4,114.02 mi (6,620.88 km) |
| Swansea to Clifton | 4,086.21 mi (6,576.13 km) |
| Swansea to Cliftonville | 4,258.39 mi (6,853.21 km) |
| Swansea to Clitheroe | 4,040.95 mi (6,503.28 km) |
| Swansea to Clydebank | 3,913.90 mi (6,298.81 km) |
| Swansea to Coalville | 4,111.98 mi (6,617.59 km) |
| Swansea to Coatbridge | 3,928.34 mi (6,322.06 km) |
| Swansea to Cobham | 4,190.36 mi (6,743.73 km) |
