| Diamond Bar to Cordele (Georgia) | 1,969.40 mi (3,169.45 km) |
| Diamond Bar to Corinth (Mississippi) | 1,664.34 mi (2,678.50 km) |
| Diamond Bar to Corinth (Texas) | 1,193.85 mi (1,921.32 km) |
| Diamond Bar to Cornelius (North Carolina) | 2,087.39 mi (3,359.34 km) |
| Diamond Bar to Cornelius (Oregon) | 842.61 mi (1,356.05 km) |
| Diamond Bar to Corning (New York) | 2,264.43 mi (3,644.25 km) |
| Diamond Bar to Corona (California) | 17.26 mi (27.77 km) |
| Diamond Bar to Coronado (California) | 99.66 mi (160.38 km) |
| Diamond Bar to Corpus Christi (Texas) | 1,284.64 mi (2,067.42 km) |
| Diamond Bar to Corsicana (Texas) | 1,241.37 mi (1,997.79 km) |
| Diamond Bar to Cortland (New York) | 2,309.65 mi (3,717.02 km) |
| Diamond Bar to Corvallis (Oregon) | 786.12 mi (1,265.14 km) |
| Diamond Bar to Coshocton (Ohio) | 2,013.52 mi (3,240.45 km) |
| Diamond Bar to Costa Mesa (California) | 23.64 mi (38.05 km) |
| Diamond Bar to Coto de Caza (California) | 30.84 mi (49.63 km) |
