| Chicago Heights to Odessa (Texas) | 1,049.47 mi (1,688.96 km) |
| Chicago Heights to Ogden (Utah) | 1,257.73 mi (2,024.12 km) |
| Chicago Heights to Oildale (California) | 1,739.22 mi (2,799.00 km) |
| Chicago Heights to Ojus (Florida) | 1,156.10 mi (1,860.57 km) |
| Chicago Heights to Okemos (Michigan) | 184.60 mi (297.09 km) |
| Chicago Heights to Oklahoma City (Oklahoma) | 677.28 mi (1,089.97 km) |
| Chicago Heights to Okmulgee (Oklahoma) | 608.21 mi (978.82 km) |
| Chicago Heights to Olathe (Kansas) | 420.22 mi (676.29 km) |
| Chicago Heights to Old Jamestown (Missouri) | 231.54 mi (372.63 km) |
| Chicago Heights to Oldsmar (Florida) | 971.23 mi (1,563.04 km) |
| Chicago Heights to Olean (New York) | 475.43 mi (765.14 km) |
| Chicago Heights to Olive Branch (Mississippi) | 468.10 mi (753.34 km) |
| Chicago Heights to Olivehurst (California) | 1,784.04 mi (2,871.14 km) |
| Chicago Heights to Olney (Maryland) | 579.42 mi (932.49 km) |
| Chicago Heights to Olympia (Washington) | 1,769.87 mi (2,848.32 km) |
