| Boulder to Clacton-on-Sea | 4,711.05 mi (7,581.70 km) |
| Boulder to Clay Cross | 4,568.10 mi (7,351.65 km) |
| Boulder to Clayton | 4,529.95 mi (7,290.24 km) |
| Boulder to Clayton le Moors | 4,511.12 mi (7,259.95 km) |
| Boulder to Cleckheaton | 4,535.37 mi (7,298.97 km) |
| Boulder to Cleethorpes | 4,598.72 mi (7,400.92 km) |
| Boulder to Clevedon | 4,587.64 mi (7,383.09 km) |
| Boulder to Clifton | 4,586.53 mi (7,381.31 km) |
| Boulder to Clifton | 4,546.14 mi (7,316.31 km) |
| Boulder to Cliftonville | 4,736.94 mi (7,623.36 km) |
| Boulder to Clitheroe | 4,507.09 mi (7,253.46 km) |
| Boulder to Clydebank | 4,363.00 mi (7,021.57 km) |
| Boulder to Coalville | 4,587.31 mi (7,382.55 km) |
| Boulder to Coatbridge | 4,376.59 mi (7,043.43 km) |
| Boulder to Cobham | 4,677.28 mi (7,527.35 km) |
