| Niederkassel to Carson (California) | 5,708.49 mi (9,186.93 km) |
| Niederkassel to Carson City (Nevada) | 5,437.31 mi (8,750.51 km) |
| Niederkassel to Carteret (New Jersey) | 3,782.72 mi (6,087.70 km) |
| Niederkassel to Cartersville (Georgia) | 4,508.79 mi (7,256.20 km) |
| Niederkassel to Carthage (Missouri) | 4,722.46 mi (7,600.07 km) |
| Niederkassel to Cary (Illinois) | 4,246.73 mi (6,834.45 km) |
| Niederkassel to Cary (North Carolina) | 4,189.86 mi (6,742.93 km) |
| Niederkassel to Casa de Oro-Mount Helix (California) | 5,732.72 mi (9,225.93 km) |
| Niederkassel to Casa Grande (Arizona) | 5,559.77 mi (8,947.59 km) |
| Niederkassel to Casas Adobes (Arizona) | 5,567.38 mi (8,959.83 km) |
| Niederkassel to Cascades (Virginia) | 3,978.97 mi (6,403.54 km) |
| Niederkassel to Casper (Wyoming) | 4,830.59 mi (7,774.08 km) |
| Niederkassel to Casselberry (Florida) | 4,642.26 mi (7,471.00 km) |
| Niederkassel to Castaic (California) | 5,681.59 mi (9,143.63 km) |
| Niederkassel to Castle Pines (Colorado) | 4,967.77 mi (7,994.86 km) |
