| Chicago Heights to Oswego (Illinois) | 38.23 mi (61.53 km) |
| Chicago Heights to Oswego (New York) | 582.51 mi (937.45 km) |
| Chicago Heights to Otsego (Minnesota) | 396.88 mi (638.72 km) |
| Chicago Heights to Ottawa (Illinois) | 62.64 mi (100.81 km) |
| Chicago Heights to Ottawa (Kansas) | 450.58 mi (725.13 km) |
| Chicago Heights to Ottumwa (Iowa) | 250.73 mi (403.51 km) |
| Chicago Heights to Overland (Missouri) | 242.19 mi (389.76 km) |
| Chicago Heights to Overland Park (Kansas) | 413.79 mi (665.93 km) |
| Chicago Heights to Overlea (Maryland) | 602.65 mi (969.87 km) |
| Chicago Heights to Oviedo (Florida) | 959.15 mi (1,543.60 km) |
| Chicago Heights to Owasso (Oklahoma) | 569.14 mi (915.95 km) |
| Chicago Heights to Owatonna (Minnesota) | 335.01 mi (539.14 km) |
| Chicago Heights to Owensboro (Kentucky) | 260.73 mi (419.60 km) |
| Chicago Heights to Owings Mills (Maryland) | 587.73 mi (945.86 km) |
| Chicago Heights to Owosso (Michigan) | 204.47 mi (329.07 km) |
