| Gaithersburg to Clacton-on-Sea | 3,706.73 mi (5,965.41 km) |
| Gaithersburg to Clay Cross | 3,574.98 mi (5,753.38 km) |
| Gaithersburg to Clayton | 3,547.14 mi (5,708.56 km) |
| Gaithersburg to Clayton le Moors | 3,524.86 mi (5,672.71 km) |
| Gaithersburg to Cleckheaton | 3,551.94 mi (5,716.29 km) |
| Gaithersburg to Cleethorpes | 3,621.94 mi (5,828.95 km) |
| Gaithersburg to Clevedon | 3,551.43 mi (5,715.47 km) |
| Gaithersburg to Clifton | 3,589.58 mi (5,776.87 km) |
| Gaithersburg to Clifton | 3,571.48 mi (5,747.73 km) |
| Gaithersburg to Cliftonville | 3,726.56 mi (5,997.32 km) |
| Gaithersburg to Clitheroe | 3,522.78 mi (5,669.36 km) |
| Gaithersburg to Clydebank | 3,411.36 mi (5,490.06 km) |
| Gaithersburg to Coalville | 3,585.57 mi (5,770.42 km) |
| Gaithersburg to Coatbridge | 3,426.07 mi (5,513.73 km) |
| Gaithersburg to Cobham | 3,654.06 mi (5,880.63 km) |
