| Allentown to Oswego (Illinois) | 672.81 mi (1,082.79 km) |
| Allentown to Oswego (New York) | 204.18 mi (328.60 km) |
| Allentown to Otsego (Minnesota) | 970.41 mi (1,561.72 km) |
| Allentown to Ottawa (Illinois) | 697.70 mi (1,122.84 km) |
| Allentown to Ottawa (Kansas) | 1,060.20 mi (1,706.23 km) |
| Allentown to Ottumwa (Iowa) | 885.16 mi (1,424.53 km) |
| Allentown to Overland (Missouri) | 802.14 mi (1,290.91 km) |
| Allentown to Overland Park (Kansas) | 1,025.41 mi (1,650.24 km) |
| Allentown to Overlea (Maryland) | 101.43 mi (163.23 km) |
| Allentown to Oviedo (Florida) | 885.92 mi (1,425.75 km) |
| Allentown to Owasso (Oklahoma) | 1,138.18 mi (1,831.72 km) |
| Allentown to Owatonna (Minnesota) | 936.28 mi (1,506.79 km) |
| Allentown to Owensboro (Kentucky) | 653.06 mi (1,051.00 km) |
| Allentown to Owings Mills (Maryland) | 107.46 mi (172.94 km) |
| Allentown to Owosso (Michigan) | 477.56 mi (768.56 km) |
