| Niagara Falls to Cocentaina | 3,958.31 mi (6,370.28 km) |
| Niagara Falls to Coin | 3,832.71 mi (6,168.15 km) |
| Niagara Falls to Colindres | 3,662.86 mi (5,894.80 km) |
| Niagara Falls to Collado-Villalba | 3,728.68 mi (6,000.73 km) |
| Niagara Falls to Colmenar Viejo | 3,738.90 mi (6,017.18 km) |
| Niagara Falls to Colmenarejo | 3,730.74 mi (6,004.04 km) |
| Niagara Falls to Conil de la Frontera | 3,783.83 mi (6,089.48 km) |
| Niagara Falls to Consuegra | 3,787.26 mi (6,095.01 km) |
| Niagara Falls to Corbera de Llobregat | 3,969.02 mi (6,387.52 km) |
| Niagara Falls to Cordoba | 3,787.89 mi (6,096.01 km) |
| Niagara Falls to Coria del Rio | 3,749.26 mi (6,033.85 km) |
| Niagara Falls to Crevillente | 3,959.44 mi (6,372.11 km) |
| Niagara Falls to Cuarte de Huerva | 3,836.24 mi (6,173.84 km) |
| Niagara Falls to Cubellas | 3,964.97 mi (6,381.01 km) |
| Niagara Falls to Cuellar | 3,689.07 mi (5,936.98 km) |
