| Allentown to Red Bank (New Jersey) | 75.98 mi (122.29 km) |
| Allentown to Red Bank (Tennessee) | 655.55 mi (1,055.01 km) |
| Allentown to Red Bluff (California) | 2,431.68 mi (3,913.41 km) |
| Allentown to Red Hill (South Carolina) | 509.60 mi (820.11 km) |
| Allentown to Red Oak (Texas) | 1,303.16 mi (2,097.24 km) |
| Allentown to Red Wing (Minnesota) | 911.74 mi (1,467.31 km) |
| Allentown to Redan (Georgia) | 672.60 mi (1,082.45 km) |
| Allentown to Redding (California) | 2,430.37 mi (3,911.30 km) |
| Allentown to Redland (Maryland) | 134.37 mi (216.25 km) |
| Allentown to Redlands (California) | 2,312.95 mi (3,722.33 km) |
| Allentown to Redmond (Oregon) | 2,314.40 mi (3,724.66 km) |
| Allentown to Redmond (Washington) | 2,327.21 mi (3,745.29 km) |
| Allentown to Redondo Beach (California) | 2,381.53 mi (3,832.70 km) |
| Allentown to Redwood City (California) | 2,488.12 mi (4,004.24 km) |
| Allentown to Reedley (California) | 2,365.76 mi (3,807.32 km) |
