| Mundelein to Oswego (Illinois) | 43.83 mi (70.53 km) |
| Mundelein to Oswego (New York) | 588.13 mi (946.51 km) |
| Mundelein to Otsego (Minnesota) | 348.03 mi (560.10 km) |
| Mundelein to Ottawa (Illinois) | 75.84 mi (122.05 km) |
| Mundelein to Ottawa (Kansas) | 457.78 mi (736.72 km) |
| Mundelein to Ottumwa (Iowa) | 243.41 mi (391.73 km) |
| Mundelein to Overland (Missouri) | 276.19 mi (444.49 km) |
| Mundelein to Overland Park (Kansas) | 420.96 mi (677.47 km) |
| Mundelein to Overlea (Maryland) | 632.98 mi (1,018.69 km) |
| Mundelein to Oviedo (Florida) | 1,014.92 mi (1,633.36 km) |
| Mundelein to Owasso (Oklahoma) | 587.52 mi (945.52 km) |
| Mundelein to Owatonna (Minnesota) | 291.54 mi (469.19 km) |
| Mundelein to Owensboro (Kentucky) | 315.29 mi (507.41 km) |
| Mundelein to Owings Mills (Maryland) | 618.21 mi (994.91 km) |
| Mundelein to Owosso (Michigan) | 201.24 mi (323.86 km) |
