| Diamond Bar to Red Bank (New Jersey) | 2,423.07 mi (3,899.56 km) |
| Diamond Bar to Red Bank (Tennessee) | 1,843.88 mi (2,967.43 km) |
| Diamond Bar to Red Bluff (California) | 491.24 mi (790.57 km) |
| Diamond Bar to Red Hill (South Carolina) | 2,212.12 mi (3,560.07 km) |
| Diamond Bar to Red Oak (Texas) | 1,217.12 mi (1,958.77 km) |
| Diamond Bar to Red Wing (Minnesota) | 1,524.76 mi (2,453.86 km) |
| Diamond Bar to Redan (Georgia) | 1,921.83 mi (3,092.88 km) |
| Diamond Bar to Redding (California) | 518.11 mi (833.81 km) |
| Diamond Bar to Redland (Maryland) | 2,265.49 mi (3,645.95 km) |
| Diamond Bar to Redlands (California) | 37.10 mi (59.71 km) |
| Diamond Bar to Redmond (Oregon) | 731.43 mi (1,177.13 km) |
| Diamond Bar to Redmond (Washington) | 970.96 mi (1,562.61 km) |
| Diamond Bar to Redondo Beach (California) | 33.58 mi (54.04 km) |
| Diamond Bar to Redwood City (California) | 345.92 mi (556.70 km) |
| Diamond Bar to Reedley (California) | 201.78 mi (324.74 km) |
