| Niederkassel to Castle Rock (Colorado) | 4,971.90 mi (8,001.50 km) |
| Niederkassel to Castro Valley (California) | 5,586.68 mi (8,990.89 km) |
| Niederkassel to Catalina Foothills (Arizona) | 5,565.32 mi (8,956.52 km) |
| Niederkassel to Cataño (Puerto Rico) | 4,508.53 mi (7,255.78 km) |
| Niederkassel to Cathedral City (California) | 5,654.46 mi (9,099.97 km) |
| Niederkassel to Catonsville (Maryland) | 3,943.14 mi (6,345.88 km) |
| Niederkassel to Cave Spring (Virginia) | 4,168.92 mi (6,709.23 km) |
| Niederkassel to Cayce (South Carolina) | 4,368.66 mi (7,030.68 km) |
| Niederkassel to Cayey (Puerto Rico) | 4,526.00 mi (7,283.89 km) |
| Niederkassel to Cedar City (Utah) | 5,328.69 mi (8,575.70 km) |
| Niederkassel to Cedar Falls (Iowa) | 4,383.38 mi (7,054.37 km) |
| Niederkassel to Cedar Hill (Texas) | 5,059.11 mi (8,141.84 km) |
| Niederkassel to Cedar Lake (Indiana) | 4,257.51 mi (6,851.80 km) |
| Niederkassel to Cedar Mill (Oregon) | 5,137.29 mi (8,267.67 km) |
| Niederkassel to Cedar Park (Texas) | 5,201.74 mi (8,371.39 km) |
