| Diamond Bar to Commerce (California) | 19.24 mi (30.96 km) |
| Diamond Bar to Commerce City (Colorado) | 821.94 mi (1,322.78 km) |
| Diamond Bar to Compton (California) | 24.69 mi (39.73 km) |
| Diamond Bar to Comstock Park (Michigan) | 1,832.85 mi (2,949.68 km) |
| Diamond Bar to Concord (California) | 360.62 mi (580.36 km) |
| Diamond Bar to Concord (Missouri) | 1,555.23 mi (2,502.90 km) |
| Diamond Bar to Concord (New Hampshire) | 2,543.12 mi (4,092.75 km) |
| Diamond Bar to Concord (North Carolina) | 2,101.79 mi (3,382.51 km) |
| Diamond Bar to Conneaut (Ohio) | 2,083.82 mi (3,353.58 km) |
| Diamond Bar to Connersville (Indiana) | 1,838.19 mi (2,958.27 km) |
| Diamond Bar to Conroe (Texas) | 1,327.97 mi (2,137.16 km) |
| Diamond Bar to Converse (Texas) | 1,185.24 mi (1,907.46 km) |
| Diamond Bar to Conway (Arkansas) | 1,440.69 mi (2,318.56 km) |
| Diamond Bar to Conway (Florida) | 2,176.75 mi (3,503.14 km) |
| Diamond Bar to Conway (South Carolina) | 2,209.47 mi (3,555.79 km) |
