| Clay to Butzbach | 4,679.56 mi (7,531.02 km) |
| Clay to Buxtehude | 4,626.37 mi (7,445.42 km) |
| Clay to Cadolzburg | 4,797.94 mi (7,721.53 km) |
| Clay to Calbe | 4,753.15 mi (7,649.46 km) |
| Clay to Calw | 4,735.97 mi (7,621.80 km) |
| Clay to Castrop-Rauxel | 4,593.40 mi (7,392.36 km) |
| Clay to Celle | 4,666.63 mi (7,510.22 km) |
| Clay to Cham | 4,876.04 mi (7,847.23 km) |
| Clay to Chemnitz | 4,831.72 mi (7,775.91 km) |
| Clay to Clausthal-Zellerfeld | 4,701.79 mi (7,566.80 km) |
| Clay to Cloppenburg | 4,583.36 mi (7,376.21 km) |
| Clay to Coburg | 4,775.26 mi (7,685.04 km) |
| Clay to Coesfeld | 4,575.90 mi (7,364.20 km) |
| Clay to Cologne | 4,597.17 mi (7,398.42 km) |
| Clay to Coswig | 4,846.87 mi (7,800.28 km) |
