| Niederkassel to Caguas (Puerto Rico) | 4,514.54 mi (7,265.46 km) |
| Niederkassel to Cahokia (Illinois) | 4,497.29 mi (7,237.68 km) |
| Niederkassel to Calabasas (California) | 5,703.04 mi (9,178.16 km) |
| Niederkassel to Caldwell (Idaho) | 5,089.29 mi (8,190.42 km) |
| Niederkassel to Caledonia (Wisconsin) | 4,204.92 mi (6,767.17 km) |
| Niederkassel to Calera (Alabama) | 4,637.89 mi (7,463.97 km) |
| Niederkassel to Calexico (California) | 5,691.70 mi (9,159.91 km) |
| Niederkassel to Calhoun (Georgia) | 4,498.05 mi (7,238.91 km) |
| Niederkassel to California (Maryland) | 3,977.72 mi (6,401.53 km) |
| Niederkassel to California City (California) | 5,619.27 mi (9,043.35 km) |
| Niederkassel to Callaway (Florida) | 4,741.61 mi (7,630.88 km) |
| Niederkassel to Calumet City (Illinois) | 4,249.89 mi (6,839.54 km) |
| Niederkassel to Calverton (Maryland) | 3,960.90 mi (6,374.45 km) |
| Niederkassel to Camano (Washington) | 4,971.62 mi (8,001.05 km) |
| Niederkassel to Camarillo (California) | 5,708.70 mi (9,187.26 km) |
