| Allentown to Orangevale (California) | 2,409.89 mi (3,878.35 km) |
| Allentown to Orchards (Washington) | 2,363.53 mi (3,803.73 km) |
| Allentown to Orcutt (California) | 2,460.75 mi (3,960.19 km) |
| Allentown to Oregon (Ohio) | 420.33 mi (676.46 km) |
| Allentown to Oregon (Wisconsin) | 734.00 mi (1,181.26 km) |
| Allentown to Oregon City (Oregon) | 2,370.20 mi (3,814.46 km) |
| Allentown to Orem (Utah) | 1,891.13 mi (3,043.48 km) |
| Allentown to Orinda (California) | 2,476.97 mi (3,986.31 km) |
| Allentown to Orland Park (Illinois) | 648.10 mi (1,043.01 km) |
| Allentown to Orlando (Florida) | 900.76 mi (1,449.64 km) |
| Allentown to Ormond Beach (Florida) | 842.61 mi (1,356.05 km) |
| Allentown to Oro Valley (Arizona) | 2,035.60 mi (3,275.98 km) |
| Allentown to Oroville (California) | 2,410.55 mi (3,879.40 km) |
| Allentown to Oshkosh (Wisconsin) | 708.38 mi (1,140.03 km) |
| Allentown to Oskaloosa (Iowa) | 895.65 mi (1,441.41 km) |
