| Allentown to Robertsville (New Jersey) | 64.60 mi (103.96 km) |
| Allentown to Robinson (Texas) | 1,359.47 mi (2,187.85 km) |
| Allentown to Robstown (Texas) | 1,539.05 mi (2,476.86 km) |
| Allentown to Rochester (Michigan) | 420.11 mi (676.11 km) |
| Allentown to Rochester (Minnesota) | 898.52 mi (1,446.03 km) |
| Allentown to Rochester (New Hampshire) | 297.04 mi (478.04 km) |
| Allentown to Rochester (New York) | 209.03 mi (336.41 km) |
| Allentown to Rochester Hills (Michigan) | 421.43 mi (678.22 km) |
| Allentown to Rock Hill (South Carolina) | 494.21 mi (795.35 km) |
| Allentown to Rock Island (Illinois) | 788.67 mi (1,269.25 km) |
| Allentown to Rock Springs (Wyoming) | 1,747.23 mi (2,811.90 km) |
| Allentown to Rockford (Illinois) | 712.48 mi (1,146.62 km) |
| Allentown to Rockledge (Florida) | 899.09 mi (1,446.94 km) |
| Allentown to Rocklin (California) | 2,408.79 mi (3,876.57 km) |
| Allentown to Rockport (Texas) | 1,500.86 mi (2,415.41 km) |
