| Duffel to Cookeville (Tennessee) | 4,331.38 mi (6,970.68 km) |
| Duffel to Coolidge (Arizona) | 5,454.57 mi (8,778.28 km) |
| Duffel to Coon Rapids (Minnesota) | 4,183.41 mi (6,732.54 km) |
| Duffel to Cooper City (Florida) | 4,620.22 mi (7,435.53 km) |
| Duffel to Coos Bay (Oregon) | 5,222.88 mi (8,405.41 km) |
| Duffel to Copiague (New York) | 3,636.40 mi (5,852.22 km) |
| Duffel to Coppell (Texas) | 4,935.82 mi (7,943.44 km) |
| Duffel to Copperas Cove (Texas) | 5,068.14 mi (8,156.38 km) |
| Duffel to Coral Gables (Florida) | 4,636.97 mi (7,462.48 km) |
| Duffel to Coral Springs (Florida) | 4,607.74 mi (7,415.44 km) |
| Duffel to Coral Terrace (Florida) | 4,636.21 mi (7,461.27 km) |
| Duffel to Coralville (Iowa) | 4,291.42 mi (6,906.37 km) |
| Duffel to Coram (New York) | 3,611.55 mi (5,812.22 km) |
| Duffel to Corcoran (California) | 5,526.03 mi (8,893.28 km) |
| Duffel to Cordele (Georgia) | 4,468.23 mi (7,190.93 km) |
