| Niederkassel to Carlsbad (New Mexico) | 5,332.92 mi (8,582.51 km) |
| Niederkassel to Carmel (Indiana) | 4,276.82 mi (6,882.88 km) |
| Niederkassel to Carmichael (California) | 5,511.45 mi (8,869.83 km) |
| Niederkassel to Carney (Maryland) | 3,927.95 mi (6,321.43 km) |
| Niederkassel to Carnot-Moon (Pennsylvania) | 4,022.74 mi (6,473.97 km) |
| Niederkassel to Carol Stream (Illinois) | 4,256.60 mi (6,850.33 km) |
| Niederkassel to Carolina (Puerto Rico) | 4,502.99 mi (7,246.87 km) |
| Niederkassel to Carolina Forest (South Carolina) | 4,290.66 mi (6,905.15 km) |
| Niederkassel to Carpentersville (Illinois) | 4,252.56 mi (6,843.83 km) |
| Niederkassel to Carpinteria (California) | 5,712.48 mi (9,193.35 km) |
| Niederkassel to Carrboro (North Carolina) | 4,193.85 mi (6,749.35 km) |
| Niederkassel to Carroll (Iowa) | 4,490.84 mi (7,227.30 km) |
| Niederkassel to Carrollton (Georgia) | 4,549.04 mi (7,320.98 km) |
| Niederkassel to Carrollton (Texas) | 5,035.26 mi (8,103.47 km) |
| Niederkassel to Carrollwood (Florida) | 4,722.31 mi (7,599.82 km) |
