| Carol Stream to Oswego (Illinois) | 19.39 mi (31.21 km) |
| Carol Stream to Oswego (New York) | 599.60 mi (964.97 km) |
| Carol Stream to Otsego (Minnesota) | 358.97 mi (577.71 km) |
| Carol Stream to Ottawa (Illinois) | 52.92 mi (85.17 km) |
| Carol Stream to Ottawa (Kansas) | 440.25 mi (708.52 km) |
| Carol Stream to Ottumwa (Iowa) | 230.49 mi (370.93 km) |
| Carol Stream to Overland (Missouri) | 251.87 mi (405.35 km) |
| Carol Stream to Overland Park (Kansas) | 403.38 mi (649.18 km) |
| Carol Stream to Overlea (Maryland) | 633.33 mi (1,019.25 km) |
| Carol Stream to Oviedo (Florida) | 995.47 mi (1,602.06 km) |
| Carol Stream to Owasso (Oklahoma) | 566.82 mi (912.21 km) |
| Carol Stream to Owatonna (Minnesota) | 298.18 mi (479.88 km) |
| Carol Stream to Owensboro (Kentucky) | 292.45 mi (470.65 km) |
| Carol Stream to Owings Mills (Maryland) | 618.47 mi (995.34 km) |
| Carol Stream to Owosso (Michigan) | 214.87 mi (345.81 km) |
