| Pianoro to Orangevale (California) | 5,980.93 mi (9,625.37 km) |
| Pianoro to Orchards (Washington) | 5,604.09 mi (9,018.91 km) |
| Pianoro to Orcutt (California) | 6,181.22 mi (9,947.72 km) |
| Pianoro to Oregon (Ohio) | 4,500.30 mi (7,242.54 km) |
| Pianoro to Oregon (Wisconsin) | 4,679.59 mi (7,531.07 km) |
| Pianoro to Oregon City (Oregon) | 5,626.13 mi (9,054.38 km) |
| Pianoro to Orem (Utah) | 5,601.30 mi (9,014.42 km) |
| Pianoro to Orinda (California) | 6,055.65 mi (9,745.62 km) |
| Pianoro to Orland Park (Illinois) | 4,679.30 mi (7,530.60 km) |
| Pianoro to Orlando (Florida) | 4,994.58 mi (8,038.01 km) |
| Pianoro to Ormond Beach (Florida) | 4,946.41 mi (7,960.48 km) |
| Pianoro to Oro Valley (Arizona) | 6,010.28 mi (9,672.61 km) |
| Pianoro to Oroville (California) | 5,942.89 mi (9,564.16 km) |
| Pianoro to Oshkosh (Wisconsin) | 4,598.93 mi (7,401.26 km) |
| Pianoro to Oskaloosa (Iowa) | 4,879.07 mi (7,852.10 km) |
