| Diamond Bar to Conyers (Georgia) | 1,932.23 mi (3,109.63 km) |
| Diamond Bar to Cookeville (Tennessee) | 1,824.39 mi (2,936.07 km) |
| Diamond Bar to Coolidge (Arizona) | 369.88 mi (595.26 km) |
| Diamond Bar to Coon Rapids (Minnesota) | 1,507.30 mi (2,425.76 km) |
| Diamond Bar to Cooper City (Florida) | 2,297.79 mi (3,697.94 km) |
| Diamond Bar to Coos Bay (Oregon) | 734.12 mi (1,181.45 km) |
| Diamond Bar to Copiague (New York) | 2,456.98 mi (3,954.12 km) |
| Diamond Bar to Coppell (Texas) | 1,200.22 mi (1,931.57 km) |
| Diamond Bar to Copperas Cove (Texas) | 1,174.00 mi (1,889.37 km) |
| Diamond Bar to Coral Gables (Florida) | 2,307.95 mi (3,714.28 km) |
| Diamond Bar to Coral Springs (Florida) | 2,293.35 mi (3,690.79 km) |
| Diamond Bar to Coral Terrace (Florida) | 2,304.87 mi (3,709.33 km) |
| Diamond Bar to Coralville (Iowa) | 1,518.90 mi (2,444.43 km) |
| Diamond Bar to Coram (New York) | 2,476.20 mi (3,985.05 km) |
| Diamond Bar to Corcoran (California) | 174.63 mi (281.04 km) |
