| Norristown to Octeville | 3,520.31 mi (5,665.39 km) |
| Norristown to Oignies | 3,693.39 mi (5,943.93 km) |
| Norristown to Oissel | 3,642.38 mi (5,861.84 km) |
| Norristown to Olivet | 3,714.41 mi (5,977.76 km) |
| Norristown to Ollioules | 4,025.07 mi (6,477.72 km) |
| Norristown to Olonne-sur-Mer | 3,588.47 mi (5,775.08 km) |
| Norristown to Oloron-Sainte-Marie | 3,730.56 mi (6,003.76 km) |
| Norristown to Onet Village | 3,842.00 mi (6,183.10 km) |
| Norristown to Onnaing | 3,720.21 mi (5,987.10 km) |
| Norristown to Orange | 3,947.68 mi (6,353.17 km) |
| Norristown to Orchies | 3,703.52 mi (5,960.23 km) |
| Norristown to Orleans | 3,713.75 mi (5,976.71 km) |
| Norristown to Orly | 3,712.35 mi (5,974.46 km) |
| Norristown to Ormesson-sur-Marne | 3,717.41 mi (5,982.59 km) |
| Norristown to Orsay | 3,704.87 mi (5,962.40 km) |
