| Niederkassel to Cicero (Illinois) | 4,246.47 mi (6,834.03 km) |
| Niederkassel to Cimarron Hills (Colorado) | 4,994.92 mi (8,038.55 km) |
| Niederkassel to Cincinnati (Ohio) | 4,253.89 mi (6,845.98 km) |
| Niederkassel to Cinco Ranch (Texas) | 5,164.75 mi (8,311.86 km) |
| Niederkassel to Circleville (Ohio) | 4,170.99 mi (6,712.57 km) |
| Niederkassel to Citrus (California) | 5,681.11 mi (9,142.86 km) |
| Niederkassel to Citrus Heights (California) | 5,506.65 mi (8,862.10 km) |
| Niederkassel to Citrus Park (Florida) | 4,723.52 mi (7,601.77 km) |
| Niederkassel to Claiborne (Louisiana) | 4,880.92 mi (7,855.08 km) |
| Niederkassel to Claremont (California) | 5,675.32 mi (9,133.55 km) |
| Niederkassel to Claremont (New Hampshire) | 3,585.71 mi (5,770.64 km) |
| Niederkassel to Claremore (Oklahoma) | 4,812.92 mi (7,745.64 km) |
| Niederkassel to Clarksburg (Maryland) | 3,965.91 mi (6,382.52 km) |
| Niederkassel to Clarksburg (West Virginia) | 4,084.25 mi (6,572.96 km) |
| Niederkassel to Clarksdale (Mississippi) | 4,733.02 mi (7,617.05 km) |
