| Niagara Falls to Carmona | 3,762.47 mi (6,055.12 km) |
| Niagara Falls to Cartagena | 3,975.19 mi (6,397.46 km) |
| Niagara Falls to Cartama | 3,836.74 mi (6,174.64 km) |
| Niagara Falls to Cartaya | 3,697.15 mi (5,949.99 km) |
| Niagara Falls to Caspe | 3,887.97 mi (6,257.09 km) |
| Niagara Falls to Cassa de la Selva | 3,993.70 mi (6,427.25 km) |
| Niagara Falls to Castalla | 3,953.13 mi (6,361.95 km) |
| Niagara Falls to Castellbisbal | 3,969.13 mi (6,387.70 km) |
| Niagara Falls to Castelldefels | 3,975.93 mi (6,398.64 km) |
| Niagara Falls to Castello de Ampurias | 3,989.27 mi (6,420.11 km) |
| Niagara Falls to Castellon de la Plana | 3,932.25 mi (6,328.35 km) |
| Niagara Falls to Castilleja de la Cuesta | 3,745.74 mi (6,028.19 km) |
| Niagara Falls to Catarroja | 3,936.19 mi (6,334.69 km) |
| Niagara Falls to Catral | 3,962.88 mi (6,377.64 km) |
| Niagara Falls to Caudete | 3,934.65 mi (6,332.21 km) |
