| Chicago Heights to Oakley (California) | 1,813.70 mi (2,918.86 km) |
| Chicago Heights to Oakton (Virginia) | 574.16 mi (924.02 km) |
| Chicago Heights to Oakville (Missouri) | 254.87 mi (410.18 km) |
| Chicago Heights to Oatfield (Oregon) | 1,759.67 mi (2,831.91 km) |
| Chicago Heights to Ocala (Florida) | 905.85 mi (1,457.82 km) |
| Chicago Heights to Ocean Acres (New Jersey) | 710.09 mi (1,142.78 km) |
| Chicago Heights to Ocean City (New Jersey) | 702.38 mi (1,130.37 km) |
| Chicago Heights to Ocean Pines (Maryland) | 694.96 mi (1,118.43 km) |
| Chicago Heights to Ocean Pointe (Hawaii) | 4,259.03 mi (6,854.25 km) |
| Chicago Heights to Ocean Springs (Mississippi) | 769.74 mi (1,238.77 km) |
| Chicago Heights to Oceanside (California) | 1,716.96 mi (2,763.18 km) |
| Chicago Heights to Oceanside (New York) | 730.85 mi (1,176.20 km) |
| Chicago Heights to Ocoee (Florida) | 957.08 mi (1,540.26 km) |
| Chicago Heights to Oconomowoc (Wisconsin) | 118.30 mi (190.39 km) |
| Chicago Heights to Odenton (Maryland) | 600.36 mi (966.18 km) |
