| Potomac to Butzbach | 4,048.62 mi (6,515.63 km) |
| Potomac to Buxtehude | 4,002.69 mi (6,441.70 km) |
| Potomac to Cadolzburg | 4,166.51 mi (6,705.35 km) |
| Potomac to Calbe | 4,127.18 mi (6,642.05 km) |
| Potomac to Calw | 4,102.23 mi (6,601.90 km) |
| Potomac to Castrop-Rauxel | 3,963.85 mi (6,379.20 km) |
| Potomac to Celle | 4,041.15 mi (6,503.60 km) |
| Potomac to Cham | 4,245.28 mi (6,832.12 km) |
| Potomac to Chemnitz | 4,204.24 mi (6,766.07 km) |
| Potomac to Clausthal-Zellerfeld | 4,074.62 mi (6,557.47 km) |
| Potomac to Cloppenburg | 3,957.08 mi (6,368.30 km) |
| Potomac to Coburg | 4,145.37 mi (6,671.32 km) |
| Potomac to Coesfeld | 3,947.09 mi (6,352.22 km) |
| Potomac to Cologne | 3,966.22 mi (6,383.02 km) |
| Potomac to Coswig | 4,220.50 mi (6,792.24 km) |
