| Harrison to Octeville | 3,414.91 mi (5,495.77 km) |
| Harrison to Oignies | 3,588.08 mi (5,774.46 km) |
| Harrison to Oissel | 3,536.99 mi (5,692.23 km) |
| Harrison to Olivet | 3,609.02 mi (5,808.16 km) |
| Harrison to Ollioules | 3,920.04 mi (6,308.69 km) |
| Harrison to Olonne-sur-Mer | 3,483.29 mi (5,605.81 km) |
| Harrison to Oloron-Sainte-Marie | 3,626.00 mi (5,835.48 km) |
| Harrison to Onet Village | 3,736.96 mi (6,014.05 km) |
| Harrison to Onnaing | 3,614.91 mi (5,817.64 km) |
| Harrison to Orange | 3,842.55 mi (6,183.98 km) |
| Harrison to Orchies | 3,598.22 mi (5,790.77 km) |
| Harrison to Orleans | 3,608.37 mi (5,807.11 km) |
| Harrison to Orly | 3,606.96 mi (5,804.84 km) |
| Harrison to Ormesson-sur-Marne | 3,612.01 mi (5,812.97 km) |
| Harrison to Orsay | 3,599.47 mi (5,792.78 km) |
