| Ontario to Carmona | 5,844.10 mi (9,405.18 km) |
| Ontario to Cartagena | 6,031.02 mi (9,705.98 km) |
| Ontario to Cartama | 5,919.97 mi (9,527.26 km) |
| Ontario to Cartaya | 5,787.42 mi (9,313.96 km) |
| Ontario to Caspe | 5,899.38 mi (9,494.13 km) |
| Ontario to Cassa de la Selva | 5,977.40 mi (9,619.70 km) |
| Ontario to Castalla | 5,997.28 mi (9,651.70 km) |
| Ontario to Castellbisbal | 5,964.14 mi (9,598.35 km) |
| Ontario to Castelldefels | 5,973.33 mi (9,613.15 km) |
| Ontario to Castello de Ampurias | 5,966.93 mi (9,602.84 km) |
| Ontario to Castellon de la Plana | 5,957.81 mi (9,588.18 km) |
| Ontario to Castilleja de la Cuesta | 5,830.08 mi (9,382.61 km) |
| Ontario to Catarroja | 5,970.35 mi (9,608.34 km) |
| Ontario to Catral | 6,012.22 mi (9,675.73 km) |
| Ontario to Caudete | 5,979.60 mi (9,623.24 km) |
