| Allentown to Odessa (Texas) | 1,605.91 mi (2,584.46 km) |
| Allentown to Ogden (Utah) | 1,891.82 mi (3,044.60 km) |
| Allentown to Oildale (California) | 2,373.31 mi (3,819.47 km) |
| Allentown to Ojus (Florida) | 1,046.65 mi (1,684.41 km) |
| Allentown to Okemos (Michigan) | 483.63 mi (778.33 km) |
| Allentown to Oklahoma City (Oklahoma) | 1,246.81 mi (2,006.54 km) |
| Allentown to Okmulgee (Oklahoma) | 1,164.98 mi (1,874.86 km) |
| Allentown to Olathe (Kansas) | 1,032.44 mi (1,661.56 km) |
| Allentown to Old Jamestown (Missouri) | 795.38 mi (1,280.04 km) |
| Allentown to Oldsmar (Florida) | 958.22 mi (1,542.11 km) |
| Allentown to Olean (New York) | 184.54 mi (296.99 km) |
| Allentown to Olive Branch (Mississippi) | 874.60 mi (1,407.53 km) |
| Allentown to Olivehurst (California) | 2,418.83 mi (3,892.73 km) |
| Allentown to Olney (Maryland) | 131.12 mi (211.01 km) |
| Allentown to Olympia (Washington) | 2,368.17 mi (3,811.21 km) |
