| Mesolongi to Octeville | 1,376.67 mi (2,215.54 km) |
| Mesolongi to Oignies | 1,229.25 mi (1,978.28 km) |
| Mesolongi to Oissel | 1,258.70 mi (2,025.68 km) |
| Mesolongi to Olivet | 1,178.07 mi (1,895.92 km) |
| Mesolongi to Ollioules | 877.88 mi (1,412.80 km) |
| Mesolongi to Olonne-sur-Mer | 1,303.93 mi (2,098.47 km) |
| Mesolongi to Oloron-Sainte-Marie | 1,196.04 mi (1,924.83 km) |
| Mesolongi to Onet Village | 1,057.72 mi (1,702.24 km) |
| Mesolongi to Onnaing | 1,204.46 mi (1,938.40 km) |
| Mesolongi to Orange | 948.50 mi (1,526.47 km) |
| Mesolongi to Orchies | 1,220.56 mi (1,964.30 km) |
| Mesolongi to Orleans | 1,178.92 mi (1,897.29 km) |
| Mesolongi to Orly | 1,187.03 mi (1,910.34 km) |
| Mesolongi to Ormesson-sur-Marne | 1,182.76 mi (1,903.47 km) |
| Mesolongi to Orsay | 1,193.58 mi (1,920.88 km) |
