| Mariehamn to Oignies | 936.65 mi (1,507.40 km) |
| Mariehamn to Oissel | 1,050.17 mi (1,690.08 km) |
| Mariehamn to Olivet | 1,111.32 mi (1,788.49 km) |
| Mariehamn to Ollioules | 1,312.17 mi (2,111.74 km) |
| Mariehamn to Olonne-sur-Mer | 1,284.81 mi (2,067.71 km) |
| Mariehamn to Oloron-Sainte-Marie | 1,449.85 mi (2,333.31 km) |
| Mariehamn to Onet Village | 1,302.82 mi (2,096.69 km) |
| Mariehamn to Onnaing | 924.79 mi (1,488.31 km) |
| Mariehamn to Orange | 1,269.07 mi (2,042.36 km) |
| Mariehamn to Orchies | 929.55 mi (1,495.96 km) |
| Mariehamn to Orleans | 1,108.88 mi (1,784.58 km) |
| Mariehamn to Orly | 1,048.38 mi (1,687.20 km) |
| Mariehamn to Ormesson-sur-Marne | 1,042.20 mi (1,677.27 km) |
| Mariehamn to Orsay | 1,056.35 mi (1,700.03 km) |
| Mariehamn to Orthez | 1,436.24 mi (2,311.40 km) |
