| Diamond Bar to Cividale del Friuli | 6,123.81 mi (9,855.32 km) |
| Diamond Bar to Civita Castellana | 6,296.46 mi (10,133.17 km) |
| Diamond Bar to Civitanova Marche | 6,284.47 mi (10,113.87 km) |
| Diamond Bar to Civitavecchia | 6,287.06 mi (10,118.04 km) |
| Diamond Bar to Civitella in Val di Chiana | 6,214.38 mi (10,001.08 km) |
| Diamond Bar to Clusone | 6,028.30 mi (9,701.62 km) |
| Diamond Bar to Coccaglio | 6,045.89 mi (9,729.92 km) |
| Diamond Bar to Codigoro | 6,151.63 mi (9,900.09 km) |
| Diamond Bar to Codogno | 6,058.18 mi (9,749.70 km) |
| Diamond Bar to Codroipo | 6,117.59 mi (9,845.32 km) |
| Diamond Bar to Cogoleto | 6,063.64 mi (9,758.48 km) |
| Diamond Bar to Colle di Val d'Elsa | 6,196.46 mi (9,972.24 km) |
| Diamond Bar to Colle Salvetti | 6,164.83 mi (9,921.34 km) |
| Diamond Bar to Collecchio | 6,095.97 mi (9,810.52 km) |
| Diamond Bar to Colleferro | 6,346.27 mi (10,213.34 km) |
