| Michigan City to Oswego (Illinois) | 75.77 mi (121.93 km) |
| Michigan City to Oswego (New York) | 540.67 mi (870.13 km) |
| Michigan City to Otsego (Minnesota) | 418.00 mi (672.71 km) |
| Michigan City to Ottawa (Illinois) | 104.13 mi (167.58 km) |
| Michigan City to Ottawa (Kansas) | 492.33 mi (792.32 km) |
| Michigan City to Ottumwa (Iowa) | 291.65 mi (469.36 km) |
| Michigan City to Overland (Missouri) | 278.22 mi (447.76 km) |
| Michigan City to Overland Park (Kansas) | 455.56 mi (733.15 km) |
| Michigan City to Overlea (Maryland) | 566.78 mi (912.14 km) |
| Michigan City to Oviedo (Florida) | 956.54 mi (1,539.40 km) |
| Michigan City to Owasso (Oklahoma) | 609.26 mi (980.51 km) |
| Michigan City to Owatonna (Minnesota) | 361.49 mi (581.77 km) |
| Michigan City to Owensboro (Kentucky) | 273.35 mi (439.92 km) |
| Michigan City to Owings Mills (Maryland) | 551.92 mi (888.23 km) |
| Michigan City to Owosso (Michigan) | 163.72 mi (263.47 km) |
