| Mortara to Oswego (Illinois) | 4,557.23 mi (7,334.15 km) |
| Mortara to Oswego (New York) | 4,003.57 mi (6,443.13 km) |
| Mortara to Otsego (Minnesota) | 4,596.41 mi (7,397.20 km) |
| Mortara to Ottawa (Illinois) | 4,591.17 mi (7,388.77 km) |
| Mortara to Ottawa (Kansas) | 4,971.32 mi (8,000.57 km) |
| Mortara to Ottumwa (Iowa) | 4,746.84 mi (7,639.30 km) |
| Mortara to Overland (Missouri) | 4,773.56 mi (7,682.30 km) |
| Mortara to Overland Park (Kansas) | 4,935.16 mi (7,942.38 km) |
| Mortara to Overlea (Maryland) | 4,166.87 mi (6,705.93 km) |
| Mortara to Oviedo (Florida) | 4,839.70 mi (7,788.74 km) |
| Mortara to Owasso (Oklahoma) | 5,105.41 mi (8,216.37 km) |
| Mortara to Owatonna (Minnesota) | 4,635.91 mi (7,460.78 km) |
| Mortara to Owensboro (Kentucky) | 4,684.00 mi (7,538.17 km) |
| Mortara to Owings Mills (Maryland) | 4,176.74 mi (6,721.82 km) |
| Mortara to Owosso (Michigan) | 4,334.96 mi (6,976.44 km) |
