| Pioltello to Oswego (Illinois) | 4,570.05 mi (7,354.79 km) |
| Pioltello to Oswego (New York) | 4,018.70 mi (6,467.48 km) |
| Pioltello to Otsego (Minnesota) | 4,606.13 mi (7,412.85 km) |
| Pioltello to Ottawa (Illinois) | 4,604.00 mi (7,409.42 km) |
| Pioltello to Ottawa (Kansas) | 4,983.41 mi (8,020.02 km) |
| Pioltello to Ottumwa (Iowa) | 4,758.78 mi (7,658.51 km) |
| Pioltello to Overland (Missouri) | 4,787.08 mi (7,704.06 km) |
| Pioltello to Overland Park (Kansas) | 4,947.31 mi (7,961.92 km) |
| Pioltello to Overlea (Maryland) | 4,183.96 mi (6,733.43 km) |
| Pioltello to Oviedo (Florida) | 4,859.87 mi (7,821.21 km) |
| Pioltello to Owasso (Oklahoma) | 5,118.24 mi (8,237.02 km) |
| Pioltello to Owatonna (Minnesota) | 4,646.28 mi (7,477.46 km) |
| Pioltello to Owensboro (Kentucky) | 4,698.87 mi (7,562.11 km) |
| Pioltello to Owings Mills (Maryland) | 4,193.74 mi (6,749.17 km) |
| Pioltello to Owosso (Michigan) | 4,348.32 mi (6,997.95 km) |
