| West Chicago to Orangeburg (South Carolina) | 705.72 mi (1,135.75 km) |
| West Chicago to Orangevale (California) | 1,742.12 mi (2,803.68 km) |
| West Chicago to Orchards (Washington) | 1,717.47 mi (2,764.00 km) |
| West Chicago to Orcutt (California) | 1,798.41 mi (2,894.26 km) |
| West Chicago to Oregon (Ohio) | 247.52 mi (398.35 km) |
| West Chicago to Oregon (Wisconsin) | 92.64 mi (149.09 km) |
| West Chicago to Oregon City (Oregon) | 1,722.13 mi (2,771.50 km) |
| West Chicago to Orem (Utah) | 1,223.40 mi (1,968.87 km) |
| West Chicago to Orinda (California) | 1,809.26 mi (2,911.73 km) |
| West Chicago to Orland Park (Illinois) | 27.35 mi (44.02 km) |
| West Chicago to Orlando (Florida) | 1,004.54 mi (1,616.65 km) |
| West Chicago to Ormond Beach (Florida) | 957.12 mi (1,540.33 km) |
| West Chicago to Oro Valley (Arizona) | 1,407.40 mi (2,264.99 km) |
| West Chicago to Oroville (California) | 1,743.18 mi (2,805.37 km) |
| West Chicago to Oshkosh (Wisconsin) | 147.92 mi (238.06 km) |
