| Ontario to Cocentaina | 5,999.56 mi (9,655.36 km) |
| Ontario to Coin | 5,916.89 mi (9,522.31 km) |
| Ontario to Colindres | 5,669.68 mi (9,124.48 km) |
| Ontario to Collado-Villalba | 5,770.97 mi (9,287.48 km) |
| Ontario to Colmenar Viejo | 5,779.54 mi (9,301.26 km) |
| Ontario to Colmenarejo | 5,773.86 mi (9,292.13 km) |
| Ontario to Conil de la Frontera | 5,877.50 mi (9,458.92 km) |
| Ontario to Consuegra | 5,839.56 mi (9,397.86 km) |
| Ontario to Corbera de Llobregat | 5,965.09 mi (9,599.89 km) |
| Ontario to Cordoba | 5,861.58 mi (9,433.31 km) |
| Ontario to Coria del Rio | 5,834.45 mi (9,389.64 km) |
| Ontario to Crevillente | 6,007.92 mi (9,668.81 km) |
| Ontario to Cuarte de Huerva | 5,849.23 mi (9,413.43 km) |
| Ontario to Cubellas | 5,965.29 mi (9,600.20 km) |
| Ontario to Cuellar | 5,724.67 mi (9,212.97 km) |
