| Chicago Heights to Orangevale (California) | 1,774.54 mi (2,855.84 km) |
| Chicago Heights to Orchards (Washington) | 1,755.46 mi (2,825.14 km) |
| Chicago Heights to Orcutt (California) | 1,826.77 mi (2,939.91 km) |
| Chicago Heights to Oregon (Ohio) | 217.39 mi (349.86 km) |
| Chicago Heights to Oregon (Wisconsin) | 132.75 mi (213.64 km) |
| Chicago Heights to Oregon City (Oregon) | 1,759.92 mi (2,832.31 km) |
| Chicago Heights to Orem (Utah) | 1,255.42 mi (2,020.40 km) |
| Chicago Heights to Orinda (California) | 1,841.15 mi (2,963.05 km) |
| Chicago Heights to Orland Park (Illinois) | 13.55 mi (21.81 km) |
| Chicago Heights to Orlando (Florida) | 967.73 mi (1,557.42 km) |
| Chicago Heights to Ormond Beach (Florida) | 919.73 mi (1,480.17 km) |
| Chicago Heights to Oro Valley (Arizona) | 1,427.28 mi (2,296.98 km) |
| Chicago Heights to Oroville (California) | 1,776.41 mi (2,858.86 km) |
| Chicago Heights to Oshkosh (Wisconsin) | 179.87 mi (289.47 km) |
| Chicago Heights to Oskaloosa (Iowa) | 259.84 mi (418.17 km) |
