| Pianoro to Oswego (Illinois) | 4,694.58 mi (7,555.19 km) |
| Pianoro to Oswego (New York) | 4,142.60 mi (6,666.88 km) |
| Pianoro to Otsego (Minnesota) | 4,730.39 mi (7,612.83 km) |
| Pianoro to Ottawa (Illinois) | 4,728.53 mi (7,609.83 km) |
| Pianoro to Ottawa (Kansas) | 5,107.98 mi (8,220.50 km) |
| Pianoro to Ottumwa (Iowa) | 4,883.35 mi (7,859.00 km) |
| Pianoro to Overland (Missouri) | 4,911.50 mi (7,904.29 km) |
| Pianoro to Overland Park (Kansas) | 5,071.88 mi (8,162.40 km) |
| Pianoro to Overlea (Maryland) | 4,306.72 mi (6,930.99 km) |
| Pianoro to Oviedo (Florida) | 4,979.51 mi (8,013.74 km) |
| Pianoro to Owasso (Oklahoma) | 5,242.77 mi (8,437.43 km) |
| Pianoro to Owatonna (Minnesota) | 4,770.69 mi (7,677.68 km) |
| Pianoro to Owensboro (Kentucky) | 4,822.89 mi (7,761.69 km) |
| Pianoro to Owings Mills (Maryland) | 4,316.57 mi (6,946.84 km) |
| Pianoro to Owosso (Michigan) | 4,472.77 mi (7,198.23 km) |
