| Diamond Bar to Carmona | 5,854.84 mi (9,422.46 km) |
| Diamond Bar to Cartagena | 6,041.48 mi (9,722.82 km) |
| Diamond Bar to Cartama | 5,930.71 mi (9,544.56 km) |
| Diamond Bar to Cartaya | 5,798.26 mi (9,331.39 km) |
| Diamond Bar to Caspe | 5,909.46 mi (9,510.36 km) |
| Diamond Bar to Cassa de la Selva | 5,987.24 mi (9,635.53 km) |
| Diamond Bar to Castalla | 6,007.64 mi (9,668.37 km) |
| Diamond Bar to Castellbisbal | 5,974.07 mi (9,614.34 km) |
| Diamond Bar to Castelldefels | 5,983.28 mi (9,629.17 km) |
| Diamond Bar to Castello de Ampurias | 5,976.71 mi (9,618.59 km) |
| Diamond Bar to Castellon de la Plana | 5,968.01 mi (9,604.59 km) |
| Diamond Bar to Castilleja de la Cuesta | 5,840.85 mi (9,399.94 km) |
| Diamond Bar to Catarroja | 5,980.62 mi (9,624.88 km) |
| Diamond Bar to Catral | 6,022.62 mi (9,692.47 km) |
| Diamond Bar to Caudete | 5,989.97 mi (9,639.92 km) |
