| Oak Forest to Odessa (Texas) | 1,048.23 mi (1,686.96 km) |
| Oak Forest to Ogden (Utah) | 1,250.85 mi (2,013.05 km) |
| Oak Forest to Oildale (California) | 1,733.55 mi (2,789.88 km) |
| Oak Forest to Ojus (Florida) | 1,164.62 mi (1,874.27 km) |
| Oak Forest to Okemos (Michigan) | 187.15 mi (301.19 km) |
| Oak Forest to Oklahoma City (Oklahoma) | 676.09 mi (1,088.07 km) |
| Oak Forest to Okmulgee (Oklahoma) | 607.73 mi (978.05 km) |
| Oak Forest to Olathe (Kansas) | 417.30 mi (671.58 km) |
| Oak Forest to Old Jamestown (Missouri) | 233.14 mi (375.20 km) |
| Oak Forest to Oldsmar (Florida) | 979.42 mi (1,576.22 km) |
| Oak Forest to Olean (New York) | 480.64 mi (773.52 km) |
| Oak Forest to Olive Branch (Mississippi) | 472.88 mi (761.03 km) |
| Oak Forest to Olivehurst (California) | 1,777.29 mi (2,860.28 km) |
| Oak Forest to Olney (Maryland) | 586.87 mi (944.47 km) |
| Oak Forest to Olympia (Washington) | 1,761.58 mi (2,834.98 km) |
