| Allentown to Ridgeland (Mississippi) | 989.20 mi (1,591.96 km) |
| Allentown to Ridgewood (New Jersey) | 76.12 mi (122.50 km) |
| Allentown to Rifle (Colorado) | 1,699.76 mi (2,735.51 km) |
| Allentown to Rincon (Georgia) | 656.48 mi (1,056.50 km) |
| Allentown to Ringwood (New Jersey) | 71.98 mi (115.84 km) |
| Allentown to Río Grande (Puerto Rico) | 1,638.24 mi (2,636.49 km) |
| Allentown to Rio Grande City (Texas) | 1,656.85 mi (2,666.45 km) |
| Allentown to Rio Linda (California) | 2,421.23 mi (3,896.59 km) |
| Allentown to Rio Rancho (New Mexico) | 1,730.79 mi (2,785.44 km) |
| Allentown to Rio Rico (Arizona) | 2,065.26 mi (3,323.71 km) |
| Allentown to Ripon (California) | 2,426.16 mi (3,904.52 km) |
| Allentown to River Edge (New Jersey) | 78.59 mi (126.48 km) |
| Allentown to River Falls (Wisconsin) | 916.82 mi (1,475.47 km) |
| Allentown to River Forest (Illinois) | 646.94 mi (1,041.15 km) |
| Allentown to River Grove (Illinois) | 648.03 mi (1,042.90 km) |
