| Fagnano Olona to Oswego (Illinois) | 4,545.02 mi (7,314.50 km) |
| Fagnano Olona to Oswego (New York) | 3,993.44 mi (6,426.82 km) |
| Fagnano Olona to Otsego (Minnesota) | 4,581.60 mi (7,373.38 km) |
| Fagnano Olona to Ottawa (Illinois) | 4,578.96 mi (7,369.13 km) |
| Fagnano Olona to Ottawa (Kansas) | 4,958.47 mi (7,979.89 km) |
| Fagnano Olona to Ottumwa (Iowa) | 4,733.86 mi (7,618.42 km) |
| Fagnano Olona to Overland (Missouri) | 4,761.96 mi (7,663.64 km) |
| Fagnano Olona to Overland Park (Kansas) | 4,922.37 mi (7,921.78 km) |
| Fagnano Olona to Overlea (Maryland) | 4,158.62 mi (6,692.66 km) |
| Fagnano Olona to Oviedo (Florida) | 4,834.68 mi (7,780.66 km) |
| Fagnano Olona to Owasso (Oklahoma) | 5,093.21 mi (8,196.73 km) |
| Fagnano Olona to Owatonna (Minnesota) | 4,621.62 mi (7,437.79 km) |
| Fagnano Olona to Owensboro (Kentucky) | 4,673.63 mi (7,521.48 km) |
| Fagnano Olona to Owings Mills (Maryland) | 4,168.40 mi (6,708.40 km) |
| Fagnano Olona to Owosso (Michigan) | 4,323.22 mi (6,957.55 km) |
