| Philadelphia to Octeville | 3,516.35 mi (5,659.01 km) |
| Philadelphia to Oignies | 3,689.94 mi (5,938.39 km) |
| Philadelphia to Oissel | 3,638.52 mi (5,855.62 km) |
| Philadelphia to Olivet | 3,710.21 mi (5,971.01 km) |
| Philadelphia to Ollioules | 4,020.04 mi (6,469.63 km) |
| Philadelphia to Olonne-sur-Mer | 3,583.67 mi (5,767.36 km) |
| Philadelphia to Oloron-Sainte-Marie | 3,725.02 mi (5,994.83 km) |
| Philadelphia to Onet Village | 3,836.99 mi (6,175.04 km) |
| Philadelphia to Onnaing | 3,716.78 mi (5,981.59 km) |
| Philadelphia to Orange | 3,942.79 mi (6,345.31 km) |
| Philadelphia to Orchies | 3,700.09 mi (5,954.72 km) |
| Philadelphia to Orleans | 3,709.57 mi (5,969.97 km) |
| Philadelphia to Orly | 3,708.42 mi (5,968.13 km) |
| Philadelphia to Ormesson-sur-Marne | 3,713.49 mi (5,976.29 km) |
| Philadelphia to Orsay | 3,700.91 mi (5,956.03 km) |
