| Diamond Bar to Romeoville (Illinois) | 1,695.76 mi (2,729.06 km) |
| Diamond Bar to Romulus (Michigan) | 1,942.22 mi (3,125.70 km) |
| Diamond Bar to Ronkonkoma (New York) | 2,470.35 mi (3,975.65 km) |
| Diamond Bar to Roosevelt (New York) | 2,446.92 mi (3,937.94 km) |
| Diamond Bar to Rosamond (California) | 64.06 mi (103.09 km) |
| Diamond Bar to Rosaryville (Maryland) | 2,284.51 mi (3,676.56 km) |
| Diamond Bar to Roscoe (Illinois) | 1,658.98 mi (2,669.87 km) |
| Diamond Bar to Rose Hill (Virginia) | 2,269.26 mi (3,652.03 km) |
| Diamond Bar to Roseburg (Oregon) | 703.49 mi (1,132.16 km) |
| Diamond Bar to Rosedale (California) | 124.29 mi (200.02 km) |
| Diamond Bar to Rosedale (Maryland) | 2,298.64 mi (3,699.30 km) |
| Diamond Bar to Roselle (Illinois) | 1,700.11 mi (2,736.07 km) |
| Diamond Bar to Roselle (New Jersey) | 2,411.66 mi (3,881.19 km) |
| Diamond Bar to Roselle Park (New Jersey) | 2,411.26 mi (3,880.55 km) |
| Diamond Bar to Rosemead (California) | 15.98 mi (25.72 km) |
