| Gaithersburg to Butzbach | 4,043.82 mi (6,507.90 km) |
| Gaithersburg to Buxtehude | 3,997.46 mi (6,433.30 km) |
| Gaithersburg to Cadolzburg | 4,161.74 mi (6,697.67 km) |
| Gaithersburg to Calbe | 4,122.08 mi (6,633.84 km) |
| Gaithersburg to Calw | 4,097.64 mi (6,594.52 km) |
| Gaithersburg to Castrop-Rauxel | 3,958.95 mi (6,371.31 km) |
| Gaithersburg to Celle | 4,036.02 mi (6,495.34 km) |
| Gaithersburg to Cham | 4,240.47 mi (6,824.38 km) |
| Gaithersburg to Chemnitz | 4,199.22 mi (6,757.99 km) |
| Gaithersburg to Clausthal-Zellerfeld | 4,069.58 mi (6,549.36 km) |
| Gaithersburg to Cloppenburg | 3,951.98 mi (6,360.10 km) |
| Gaithersburg to Coburg | 4,140.49 mi (6,663.48 km) |
| Gaithersburg to Coesfeld | 3,942.14 mi (6,344.26 km) |
| Gaithersburg to Cologne | 3,961.41 mi (6,375.28 km) |
| Gaithersburg to Coswig | 4,215.42 mi (6,784.06 km) |
