| Duffel to Caguas (Puerto Rico) | 4,405.82 mi (7,090.48 km) |
| Duffel to Cahokia (Illinois) | 4,392.90 mi (7,069.68 km) |
| Duffel to Calabasas (California) | 5,613.35 mi (9,033.82 km) |
| Duffel to Caldwell (Idaho) | 5,004.30 mi (8,053.64 km) |
| Duffel to Caledonia (Wisconsin) | 4,101.95 mi (6,601.44 km) |
| Duffel to Calera (Alabama) | 4,529.89 mi (7,290.15 km) |
| Duffel to Calexico (California) | 5,598.65 mi (9,010.15 km) |
| Duffel to Calhoun (Georgia) | 4,389.97 mi (7,064.98 km) |
| Duffel to California (Maryland) | 3,868.70 mi (6,226.07 km) |
| Duffel to California City (California) | 5,529.57 mi (8,898.98 km) |
| Duffel to Callaway (Florida) | 4,632.35 mi (7,455.05 km) |
| Duffel to Calumet City (Illinois) | 4,146.07 mi (6,672.45 km) |
| Duffel to Calverton (Maryland) | 3,852.27 mi (6,199.62 km) |
| Duffel to Camano (Washington) | 4,894.80 mi (7,877.42 km) |
| Duffel to Camarillo (California) | 5,619.36 mi (9,043.49 km) |
