| Diamond Bar to Cullman (Alabama) | 1,765.58 mi (2,841.43 km) |
| Diamond Bar to Culpeper (Virginia) | 2,222.99 mi (3,577.56 km) |
| Diamond Bar to Culver City (California) | 33.27 mi (53.54 km) |
| Diamond Bar to Cumberland (Maryland) | 2,177.64 mi (3,504.57 km) |
| Diamond Bar to Cupertino (California) | 330.00 mi (531.08 km) |
| Diamond Bar to Cutler Bay (Florida) | 2,307.79 mi (3,714.03 km) |
| Diamond Bar to Cutlerville (Michigan) | 1,830.90 mi (2,946.54 km) |
| Diamond Bar to Cuyahoga Falls (Ohio) | 2,032.30 mi (3,270.67 km) |
| Diamond Bar to Cypress (California) | 17.92 mi (28.84 km) |
| Diamond Bar to Cypress Gardens (Florida) | 2,167.99 mi (3,489.04 km) |
| Diamond Bar to Cypress Lake (Florida) | 2,192.43 mi (3,528.37 km) |
| Diamond Bar to D'Iberville (Mississippi) | 1,701.67 mi (2,738.58 km) |
| Diamond Bar to Dakota Ridge (Colorado) | 800.72 mi (1,288.63 km) |
| Diamond Bar to Dale City (Virginia) | 2,257.26 mi (3,632.72 km) |
| Diamond Bar to Dallas (Georgia) | 1,881.46 mi (3,027.91 km) |
