| Diamond Bar to Cocentaina | 6,009.89 mi (9,671.99 km) |
| Diamond Bar to Coin | 5,927.64 mi (9,539.62 km) |
| Diamond Bar to Colindres | 5,679.78 mi (9,140.72 km) |
| Diamond Bar to Collado-Villalba | 5,781.35 mi (9,304.18 km) |
| Diamond Bar to Colmenar Viejo | 5,789.90 mi (9,317.94 km) |
| Diamond Bar to Colmenarejo | 5,784.24 mi (9,308.84 km) |
| Diamond Bar to Conil de la Frontera | 5,888.36 mi (9,476.40 km) |
| Diamond Bar to Consuegra | 5,850.01 mi (9,414.69 km) |
| Diamond Bar to Corbera de Llobregat | 5,975.04 mi (9,615.89 km) |
| Diamond Bar to Cordoba | 5,872.24 mi (9,450.46 km) |
| Diamond Bar to Coria del Rio | 5,845.23 mi (9,406.99 km) |
| Diamond Bar to Crevillente | 6,018.32 mi (9,685.54 km) |
| Diamond Bar to Cuarte de Huerva | 5,859.34 mi (9,429.69 km) |
| Diamond Bar to Cubellas | 5,975.26 mi (9,616.26 km) |
| Diamond Bar to Cuellar | 5,735.00 mi (9,229.59 km) |
