| Duffel to Carson (California) | 5,618.29 mi (9,041.76 km) |
| Duffel to Carson City (Nevada) | 5,351.71 mi (8,612.74 km) |
| Duffel to Carteret (New Jersey) | 3,673.98 mi (5,912.70 km) |
| Duffel to Cartersville (Georgia) | 4,400.56 mi (7,082.02 km) |
| Duffel to Carthage (Missouri) | 4,619.16 mi (7,433.82 km) |
| Duffel to Cary (Illinois) | 4,143.56 mi (6,668.41 km) |
| Duffel to Cary (North Carolina) | 4,080.58 mi (6,567.05 km) |
| Duffel to Casa de Oro-Mount Helix (California) | 5,640.85 mi (9,078.07 km) |
| Duffel to Casa Grande (Arizona) | 5,464.13 mi (8,793.66 km) |
| Duffel to Casas Adobes (Arizona) | 5,470.90 mi (8,804.56 km) |
| Duffel to Cascades (Virginia) | 3,870.45 mi (6,228.88 km) |
| Duffel to Casper (Wyoming) | 4,737.57 mi (7,624.38 km) |
| Duffel to Casselberry (Florida) | 4,531.80 mi (7,293.23 km) |
| Duffel to Castaic (California) | 5,592.08 mi (8,999.58 km) |
| Duffel to Castle Pines (Colorado) | 4,871.54 mi (7,839.99 km) |
