| Duffel to Castle Rock (Colorado) | 4,875.60 mi (7,846.53 km) |
| Duffel to Castro Valley (California) | 5,502.11 mi (8,854.80 km) |
| Duffel to Catalina Foothills (Arizona) | 5,468.73 mi (8,801.07 km) |
| Duffel to Cataño (Puerto Rico) | 4,399.71 mi (7,080.65 km) |
| Duffel to Cathedral City (California) | 5,562.83 mi (8,952.51 km) |
| Duffel to Catonsville (Maryland) | 3,834.53 mi (6,171.08 km) |
| Duffel to Cave Spring (Virginia) | 4,060.42 mi (6,534.61 km) |
| Duffel to Cayce (South Carolina) | 4,259.36 mi (6,854.77 km) |
| Duffel to Cayey (Puerto Rico) | 4,417.27 mi (7,108.91 km) |
| Duffel to Cedar City (Utah) | 5,236.90 mi (8,427.97 km) |
| Duffel to Cedar Falls (Iowa) | 4,282.31 mi (6,891.71 km) |
| Duffel to Cedar Hill (Texas) | 4,954.78 mi (7,973.95 km) |
| Duffel to Cedar Lake (Indiana) | 4,153.50 mi (6,684.42 km) |
| Duffel to Cedar Mill (Oregon) | 5,058.75 mi (8,141.28 km) |
| Duffel to Cedar Park (Texas) | 5,096.89 mi (8,202.66 km) |
