| Middlesex to Octeville | 3,466.23 mi (5,578.37 km) |
| Middlesex to Oignies | 3,639.41 mi (5,857.06 km) |
| Middlesex to Oissel | 3,588.32 mi (5,774.84 km) |
| Middlesex to Olivet | 3,660.32 mi (5,890.72 km) |
| Middlesex to Ollioules | 3,971.09 mi (6,390.85 km) |
| Middlesex to Olonne-sur-Mer | 3,534.43 mi (5,688.12 km) |
| Middlesex to Oloron-Sainte-Marie | 3,676.77 mi (5,917.19 km) |
| Middlesex to Onet Village | 3,788.01 mi (6,096.22 km) |
| Middlesex to Onnaing | 3,666.24 mi (5,900.24 km) |
| Middlesex to Orange | 3,893.66 mi (6,266.24 km) |
| Middlesex to Orchies | 3,649.54 mi (5,873.37 km) |
| Middlesex to Orleans | 3,659.67 mi (5,889.66 km) |
| Middlesex to Orly | 3,658.29 mi (5,887.44 km) |
| Middlesex to Ormesson-sur-Marne | 3,663.34 mi (5,895.57 km) |
| Middlesex to Orsay | 3,650.79 mi (5,875.38 km) |
