| Diamond Bar to Carrollwood (Florida) | 2,119.22 mi (3,410.56 km) |
| Diamond Bar to Carson (California) | 27.58 mi (44.39 km) |
| Diamond Bar to Carson City (Nevada) | 371.72 mi (598.22 km) |
| Diamond Bar to Carteret (New Jersey) | 2,413.58 mi (3,884.29 km) |
| Diamond Bar to Cartersville (Georgia) | 1,880.96 mi (3,027.12 km) |
| Diamond Bar to Carthage (Missouri) | 1,334.57 mi (2,147.79 km) |
| Diamond Bar to Cary (Illinois) | 1,694.48 mi (2,727.00 km) |
| Diamond Bar to Cary (North Carolina) | 2,198.93 mi (3,538.84 km) |
| Diamond Bar to Casa de Oro-Mount Helix (California) | 98.35 mi (158.28 km) |
| Diamond Bar to Casa Grande (Arizona) | 356.99 mi (574.51 km) |
| Diamond Bar to Casas Adobes (Arizona) | 409.77 mi (659.45 km) |
| Diamond Bar to Cascades (Virginia) | 2,253.00 mi (3,625.86 km) |
| Diamond Bar to Casper (Wyoming) | 870.51 mi (1,400.95 km) |
| Diamond Bar to Casselberry (Florida) | 2,173.54 mi (3,497.98 km) |
| Diamond Bar to Castaic (California) | 57.28 mi (92.19 km) |
