| Piqua to Octeville | 3,889.23 mi (6,259.12 km) |
| Piqua to Oignies | 4,049.99 mi (6,517.83 km) |
| Piqua to Oissel | 4,008.67 mi (6,451.33 km) |
| Piqua to Olivet | 4,087.61 mi (6,578.37 km) |
| Piqua to Ollioules | 4,414.74 mi (7,104.84 km) |
| Piqua to Olonne-sur-Mer | 3,974.78 mi (6,396.79 km) |
| Piqua to Oloron-Sainte-Marie | 4,131.41 mi (6,648.86 km) |
| Piqua to Onet Village | 4,231.87 mi (6,810.54 km) |
| Piqua to Onnaing | 4,076.27 mi (6,560.13 km) |
| Piqua to Orange | 4,334.63 mi (6,975.92 km) |
| Piqua to Orchies | 4,059.67 mi (6,533.40 km) |
| Piqua to Orleans | 4,086.73 mi (6,576.96 km) |
| Piqua to Orly | 4,079.87 mi (6,565.92 km) |
| Piqua to Ormesson-sur-Marne | 4,084.44 mi (6,573.28 km) |
| Piqua to Orsay | 4,072.99 mi (6,554.84 km) |
