| Langley Park to Octeville | 3,637.29 mi (5,853.65 km) |
| Langley Park to Oignies | 3,810.64 mi (6,132.63 km) |
| Langley Park to Oissel | 3,759.42 mi (6,050.21 km) |
| Langley Park to Olivet | 3,831.20 mi (6,165.73 km) |
| Langley Park to Ollioules | 4,140.89 mi (6,664.11 km) |
| Langley Park to Olonne-sur-Mer | 3,704.61 mi (5,962.00 km) |
| Langley Park to Oloron-Sainte-Marie | 3,845.51 mi (6,188.74 km) |
| Langley Park to Onet Village | 3,957.85 mi (6,369.54 km) |
| Langley Park to Onnaing | 3,837.46 mi (6,175.80 km) |
| Langley Park to Orange | 4,063.70 mi (6,539.89 km) |
| Langley Park to Orchies | 3,820.77 mi (6,148.94 km) |
| Langley Park to Orleans | 3,830.56 mi (6,164.69 km) |
| Langley Park to Orly | 3,829.35 mi (6,162.75 km) |
| Langley Park to Ormesson-sur-Marne | 3,834.42 mi (6,170.90 km) |
| Langley Park to Orsay | 3,821.85 mi (6,150.67 km) |
