| Diamond Bar to Rockville (Maryland) | 2,265.25 mi (3,645.57 km) |
| Diamond Bar to Rockville Centre (New York) | 2,444.13 mi (3,933.45 km) |
| Diamond Bar to Rockwall (Texas) | 1,232.39 mi (1,983.33 km) |
| Diamond Bar to Rocky Mount (North Carolina) | 2,253.28 mi (3,626.30 km) |
| Diamond Bar to Rocky Point (New York) | 2,479.58 mi (3,990.49 km) |
| Diamond Bar to Rocky River (Ohio) | 2,016.05 mi (3,244.52 km) |
| Diamond Bar to Roessleville (New York) | 2,430.70 mi (3,911.84 km) |
| Diamond Bar to Rogers (Arkansas) | 1,342.86 mi (2,161.12 km) |
| Diamond Bar to Rogers (Minnesota) | 1,495.49 mi (2,406.75 km) |
| Diamond Bar to Rohnert Park (California) | 405.30 mi (652.26 km) |
| Diamond Bar to Rolla (Missouri) | 1,477.20 mi (2,377.32 km) |
| Diamond Bar to Rolling Meadows (Illinois) | 1,704.23 mi (2,742.70 km) |
| Diamond Bar to Roma (Texas) | 1,236.67 mi (1,990.23 km) |
| Diamond Bar to Rome (Georgia) | 1,858.12 mi (2,990.35 km) |
| Diamond Bar to Rome (New York) | 2,345.22 mi (3,774.26 km) |
