| Piqua to Odenton (Maryland) | 408.70 mi (657.74 km) |
| Piqua to Odessa (Texas) | 1,158.57 mi (1,864.54 km) |
| Piqua to Ogden (Utah) | 1,448.23 mi (2,330.69 km) |
| Piqua to Oildale (California) | 1,914.69 mi (3,081.40 km) |
| Piqua to Ojus (Florida) | 1,008.51 mi (1,623.04 km) |
| Piqua to Okemos (Michigan) | 176.76 mi (284.46 km) |
| Piqua to Oklahoma City (Oklahoma) | 792.26 mi (1,275.02 km) |
| Piqua to Okmulgee (Oklahoma) | 713.16 mi (1,147.72 km) |
| Piqua to Olathe (Kansas) | 570.11 mi (917.51 km) |
| Piqua to Old Jamestown (Missouri) | 334.49 mi (538.31 km) |
| Piqua to Oldsmar (Florida) | 840.82 mi (1,353.18 km) |
| Piqua to Olean (New York) | 330.56 mi (531.99 km) |
| Piqua to Olive Branch (Mississippi) | 471.75 mi (759.20 km) |
| Piqua to Olivehurst (California) | 1,972.68 mi (3,174.73 km) |
| Piqua to Olney (Maryland) | 387.72 mi (623.98 km) |
