| Niagara Falls to Cadiz | 3,764.04 mi (6,057.64 km) |
| Niagara Falls to Calafell | 3,960.68 mi (6,374.09 km) |
| Niagara Falls to Calahorra | 3,764.90 mi (6,059.02 km) |
| Niagara Falls to Calasparra | 3,918.95 mi (6,306.95 km) |
| Niagara Falls to Calatayud | 3,812.08 mi (6,134.95 km) |
| Niagara Falls to Caldas de Montbuy | 3,971.75 mi (6,391.91 km) |
| Niagara Falls to Caldas de Reyes | 3,453.74 mi (5,558.25 km) |
| Niagara Falls to Calella | 3,994.25 mi (6,428.12 km) |
| Niagara Falls to Callosa de Segura | 3,960.78 mi (6,374.26 km) |
| Niagara Falls to Calpe | 3,984.17 mi (6,411.90 km) |
| Niagara Falls to Calvia | 4,062.04 mi (6,537.22 km) |
| Niagara Falls to Camas | 3,745.88 mi (6,028.40 km) |
| Niagara Falls to Cambados | 3,449.47 mi (5,551.39 km) |
| Niagara Falls to Cambre | 3,447.10 mi (5,547.58 km) |
| Niagara Falls to Cambrils | 3,942.57 mi (6,344.96 km) |
