| Oak Forest to Orangevale (California) | 1,767.90 mi (2,845.16 km) |
| Oak Forest to Orchards (Washington) | 1,747.37 mi (2,812.13 km) |
| Oak Forest to Orcutt (California) | 1,821.12 mi (2,930.81 km) |
| Oak Forest to Oregon (Ohio) | 223.14 mi (359.10 km) |
| Oak Forest to Oregon (Wisconsin) | 123.76 mi (199.18 km) |
| Oak Forest to Oregon City (Oregon) | 1,751.89 mi (2,819.39 km) |
| Oak Forest to Orem (Utah) | 1,248.86 mi (2,009.85 km) |
| Oak Forest to Orinda (California) | 1,834.64 mi (2,952.57 km) |
| Oak Forest to Orland Park (Illinois) | 5.64 mi (9.08 km) |
| Oak Forest to Orlando (Florida) | 976.22 mi (1,571.08 km) |
| Oak Forest to Ormond Beach (Florida) | 928.32 mi (1,493.99 km) |
| Oak Forest to Oro Valley (Arizona) | 1,423.61 mi (2,291.08 km) |
| Oak Forest to Oroville (California) | 1,769.57 mi (2,847.84 km) |
| Oak Forest to Oshkosh (Wisconsin) | 171.98 mi (276.77 km) |
| Oak Forest to Oskaloosa (Iowa) | 254.02 mi (408.80 km) |
