| Duncan to Clacton-on-Sea | 4,738.28 mi (7,625.53 km) |
| Duncan to Clay Cross | 4,598.74 mi (7,400.96 km) |
| Duncan to Clayton | 4,564.87 mi (7,346.45 km) |
| Duncan to Clayton le Moors | 4,544.18 mi (7,313.15 km) |
| Duncan to Cleckheaton | 4,570.08 mi (7,354.83 km) |
| Duncan to Cleethorpes | 4,637.40 mi (7,463.17 km) |
| Duncan to Clevedon | 4,597.95 mi (7,399.69 km) |
| Duncan to Clifton | 4,615.61 mi (7,428.11 km) |
| Duncan to Clifton | 4,585.07 mi (7,378.95 km) |
| Duncan to Cliftonville | 4,761.61 mi (7,663.07 km) |
| Duncan to Clitheroe | 4,540.99 mi (7,308.02 km) |
| Duncan to Clydebank | 4,409.76 mi (7,096.82 km) |
| Duncan to Coalville | 4,614.14 mi (7,425.74 km) |
| Duncan to Coatbridge | 4,424.06 mi (7,119.84 km) |
| Duncan to Cobham | 4,695.02 mi (7,555.91 km) |
