| Diamond Bar to Reidsville (North Carolina) | 2,146.54 mi (3,454.52 km) |
| Diamond Bar to Reisterstown (Maryland) | 2,281.77 mi (3,672.16 km) |
| Diamond Bar to Rendon (Texas) | 1,190.73 mi (1,916.29 km) |
| Diamond Bar to Reno (Nevada) | 399.62 mi (643.13 km) |
| Diamond Bar to Renton (Washington) | 958.67 mi (1,542.83 km) |
| Diamond Bar to Republic (Missouri) | 1,382.88 mi (2,225.53 km) |
| Diamond Bar to Reston (Virginia) | 2,255.68 mi (3,630.17 km) |
| Diamond Bar to Revere (Massachusetts) | 2,573.34 mi (4,141.38 km) |
| Diamond Bar to Rexburg (Idaho) | 751.52 mi (1,209.45 km) |
| Diamond Bar to Reynoldsburg (Ohio) | 1,963.21 mi (3,159.48 km) |
| Diamond Bar to Rialto (California) | 25.77 mi (41.47 km) |
| Diamond Bar to Richardson (Texas) | 1,216.22 mi (1,957.31 km) |
| Diamond Bar to Richfield (Minnesota) | 1,500.78 mi (2,415.28 km) |
| Diamond Bar to Richfield (Wisconsin) | 1,708.21 mi (2,749.10 km) |
| Diamond Bar to Richland (Washington) | 852.23 mi (1,371.52 km) |
