| Allentown to Romeoville (Illinois) | 660.43 mi (1,062.86 km) |
| Allentown to Romulus (Michigan) | 423.88 mi (682.17 km) |
| Allentown to Ronkonkoma (New York) | 123.98 mi (199.52 km) |
| Allentown to Roosevelt (New York) | 99.36 mi (159.90 km) |
| Allentown to Rosamond (California) | 2,345.49 mi (3,774.71 km) |
| Allentown to Rosaryville (Maryland) | 145.35 mi (233.92 km) |
| Allentown to Roscoe (Illinois) | 710.69 mi (1,143.75 km) |
| Allentown to Rose Hill (Virginia) | 152.17 mi (244.89 km) |
| Allentown to Roseburg (Oregon) | 2,434.71 mi (3,918.28 km) |
| Allentown to Rosedale (California) | 2,383.51 mi (3,835.89 km) |
| Allentown to Rosedale (Maryland) | 103.37 mi (166.35 km) |
| Allentown to Roselle (Illinois) | 661.02 mi (1,063.82 km) |
| Allentown to Roselle (New Jersey) | 63.87 mi (102.79 km) |
| Allentown to Roselle Park (New Jersey) | 63.58 mi (102.31 km) |
| Allentown to Rosemead (California) | 2,360.21 mi (3,798.38 km) |
