| Gaithersburg to Caldicot | 3,552.63 mi (5,717.40 km) |
| Gaithersburg to Calne | 3,586.32 mi (5,771.63 km) |
| Gaithersburg to Cam | 3,566.16 mi (5,739.18 km) |
| Gaithersburg to Camberley | 3,640.30 mi (5,858.50 km) |
| Gaithersburg to Camborne | 3,473.72 mi (5,590.40 km) |
| Gaithersburg to Cambridge | 3,656.16 mi (5,884.02 km) |
| Gaithersburg to Cambuslang | 3,421.42 mi (5,506.24 km) |
| Gaithersburg to Canford Cliffs | 3,605.13 mi (5,801.90 km) |
| Gaithersburg to Cannock | 3,559.87 mi (5,729.06 km) |
| Gaithersburg to Canterbury | 3,715.90 mi (5,980.17 km) |
| Gaithersburg to Carlisle | 3,483.13 mi (5,605.55 km) |
| Gaithersburg to Carlton Colville | 3,713.41 mi (5,976.16 km) |
| Gaithersburg to Carluke | 3,435.34 mi (5,528.65 km) |
| Gaithersburg to Carnoustie | 3,465.48 mi (5,577.15 km) |
| Gaithersburg to Carshalton | 3,663.11 mi (5,895.21 km) |
