| Diamond Bar to Castrovillari | 6,552.98 mi (10,546.00 km) |
| Diamond Bar to Catania | 6,644.28 mi (10,692.94 km) |
| Diamond Bar to Catanzaro | 6,616.55 mi (10,648.31 km) |
| Diamond Bar to Cattolica | 6,217.25 mi (10,005.70 km) |
| Diamond Bar to Cava de' Tirreni | 6,456.53 mi (10,390.77 km) |
| Diamond Bar to Cavallino | 6,587.26 mi (10,601.18 km) |
| Diamond Bar to Cavarzere | 6,134.35 mi (9,872.28 km) |
| Diamond Bar to Cave | 6,339.09 mi (10,201.78 km) |
| Diamond Bar to Cavriago | 6,108.73 mi (9,831.04 km) |
| Diamond Bar to Cavriglia | 6,201.58 mi (9,980.48 km) |
| Diamond Bar to Cazzago San Martino | 6,046.43 mi (9,730.79 km) |
| Diamond Bar to Ceccano | 6,365.48 mi (10,244.26 km) |
| Diamond Bar to Cecina | 6,180.79 mi (9,947.02 km) |
| Diamond Bar to Cefalu | 6,579.15 mi (10,588.12 km) |
| Diamond Bar to Ceglie Messapico | 6,547.14 mi (10,536.60 km) |
