| Diamond Bar to Castle Pines (Colorado) | 809.04 mi (1,302.03 km) |
| Diamond Bar to Castle Rock (Colorado) | 807.50 mi (1,299.54 km) |
| Diamond Bar to Castro Valley (California) | 349.55 mi (562.55 km) |
| Diamond Bar to Catalina Foothills (Arizona) | 417.65 mi (672.14 km) |
| Diamond Bar to Cataño (Puerto Rico) | 3,340.53 mi (5,376.07 km) |
| Diamond Bar to Cathedral City (California) | 78.33 mi (126.05 km) |
| Diamond Bar to Catonsville (Maryland) | 2,286.45 mi (3,679.69 km) |
| Diamond Bar to Cave Spring (Virginia) | 2,121.37 mi (3,414.01 km) |
| Diamond Bar to Cayce (South Carolina) | 2,095.49 mi (3,372.36 km) |
| Diamond Bar to Cayey (Puerto Rico) | 3,350.46 mi (5,392.05 km) |
| Diamond Bar to Cedar City (Utah) | 366.92 mi (590.49 km) |
| Diamond Bar to Cedar Falls (Iowa) | 1,489.27 mi (2,396.75 km) |
| Diamond Bar to Cedar Hill (Texas) | 1,206.49 mi (1,941.67 km) |
| Diamond Bar to Cedar Lake (Indiana) | 1,727.19 mi (2,779.64 km) |
| Diamond Bar to Cedar Mill (Oregon) | 839.44 mi (1,350.95 km) |
