| Union to Octeville | 4,239.17 mi (6,822.29 km) |
| Union to Oignies | 4,393.41 mi (7,070.51 km) |
| Union to Oissel | 4,356.99 mi (7,011.90 km) |
| Union to Olivet | 4,439.03 mi (7,143.93 km) |
| Union to Ollioules | 4,773.09 mi (7,681.55 km) |
| Union to Olonne-sur-Mer | 4,332.52 mi (6,972.52 km) |
| Union to Oloron-Sainte-Marie | 4,495.14 mi (7,234.23 km) |
| Union to Onet Village | 4,590.67 mi (7,387.97 km) |
| Union to Onnaing | 4,419.34 mi (7,112.25 km) |
| Union to Orange | 4,691.91 mi (7,550.89 km) |
| Union to Orchies | 4,402.83 mi (7,085.68 km) |
| Union to Orleans | 4,438.05 mi (7,142.34 km) |
| Union to Orly | 4,428.59 mi (7,127.12 km) |
| Union to Ormesson-sur-Marne | 4,432.91 mi (7,134.08 km) |
| Union to Orsay | 4,422.01 mi (7,116.54 km) |
