| Allentown to Reidsville (North Carolina) | 371.54 mi (597.94 km) |
| Allentown to Reisterstown (Maryland) | 105.97 mi (170.54 km) |
| Allentown to Rendon (Texas) | 1,323.45 mi (2,129.88 km) |
| Allentown to Reno (Nevada) | 2,322.00 mi (3,736.90 km) |
| Allentown to Renton (Washington) | 2,332.03 mi (3,753.03 km) |
| Allentown to Republic (Missouri) | 993.65 mi (1,599.12 km) |
| Allentown to Reston (Virginia) | 151.01 mi (243.03 km) |
| Allentown to Revere (Massachusetts) | 263.37 mi (423.86 km) |
| Allentown to Rexburg (Idaho) | 1,856.81 mi (2,988.25 km) |
| Allentown to Reynoldsburg (Ohio) | 388.18 mi (624.71 km) |
| Allentown to Rialto (California) | 2,322.54 mi (3,737.76 km) |
| Allentown to Richardson (Texas) | 1,283.35 mi (2,065.35 km) |
| Allentown to Richfield (Minnesota) | 948.53 mi (1,526.52 km) |
| Allentown to Richfield (Wisconsin) | 680.45 mi (1,095.08 km) |
| Allentown to Richland (Washington) | 2,204.22 mi (3,547.35 km) |
