| Diamond Bar to Rosemont (California) | 370.92 mi (596.93 km) |
| Diamond Bar to Rosemount (Minnesota) | 1,507.44 mi (2,425.99 km) |
| Diamond Bar to Rosenberg (Texas) | 1,325.20 mi (2,132.70 km) |
| Diamond Bar to Roseville (California) | 382.86 mi (616.16 km) |
| Diamond Bar to Roseville (Michigan) | 1,965.94 mi (3,163.87 km) |
| Diamond Bar to Roseville (Minnesota) | 1,510.16 mi (2,430.37 km) |
| Diamond Bar to Rossmoor (California) | 21.00 mi (33.80 km) |
| Diamond Bar to Rossville (Maryland) | 2,300.18 mi (3,701.79 km) |
| Diamond Bar to Roswell (Georgia) | 1,907.75 mi (3,070.22 km) |
| Diamond Bar to Roswell (New Mexico) | 764.56 mi (1,230.45 km) |
| Diamond Bar to Round Lake (Illinois) | 1,703.25 mi (2,741.12 km) |
| Diamond Bar to Round Lake Beach (Illinois) | 1,704.92 mi (2,743.81 km) |
| Diamond Bar to Round Rock (Texas) | 1,199.48 mi (1,930.38 km) |
| Diamond Bar to Rowland Heights (California) | 4.71 mi (7.57 km) |
| Diamond Bar to Rowlett (Texas) | 1,226.02 mi (1,973.09 km) |
