| Williamsport to Orangeburg (South Carolina) | 574.94 mi (925.28 km) |
| Williamsport to Orangevale (California) | 2,321.22 mi (3,735.65 km) |
| Williamsport to Orchards (Washington) | 2,270.97 mi (3,654.77 km) |
| Williamsport to Orcutt (California) | 2,375.89 mi (3,823.63 km) |
| Williamsport to Oregon (Ohio) | 332.35 mi (534.87 km) |
| Williamsport to Oregon (Wisconsin) | 643.41 mi (1,035.47 km) |
| Williamsport to Oregon City (Oregon) | 2,277.72 mi (3,665.64 km) |
| Williamsport to Orem (Utah) | 1,802.89 mi (2,901.47 km) |
| Williamsport to Orinda (California) | 2,388.75 mi (3,844.33 km) |
| Williamsport to Orland Park (Illinois) | 561.03 mi (902.89 km) |
| Williamsport to Orlando (Florida) | 914.55 mi (1,471.83 km) |
| Williamsport to Ormond Beach (Florida) | 856.05 mi (1,377.68 km) |
| Williamsport to Oro Valley (Arizona) | 1,959.06 mi (3,152.80 km) |
| Williamsport to Oroville (California) | 2,321.18 mi (3,735.57 km) |
| Williamsport to Oshkosh (Wisconsin) | 615.97 mi (991.31 km) |
