| Mariehamn to Orzesze | 689.04 mi (1,108.90 km) |
| Mariehamn to Osowa | 395.72 mi (636.85 km) |
| Mariehamn to Ostroda | 442.20 mi (711.65 km) |
| Mariehamn to Ostroleka | 489.87 mi (788.37 km) |
| Mariehamn to Ostrow Mazowiecka | 509.88 mi (820.58 km) |
| Mariehamn to Ostrow Wielkopolski | 589.54 mi (948.77 km) |
| Mariehamn to Ostrowiec Swietokrzyski | 635.91 mi (1,023.40 km) |
| Mariehamn to Ostrzeszow | 604.90 mi (973.50 km) |
| Mariehamn to Oswiecim | 695.77 mi (1,119.73 km) |
| Mariehamn to Otwock | 553.95 mi (891.50 km) |
| Mariehamn to Ozarow Mazowiecki | 545.69 mi (878.20 km) |
| Mariehamn to Ozimek | 654.77 mi (1,053.75 km) |
| Mariehamn to Ozorkow | 562.51 mi (905.27 km) |
| Mariehamn to Pabianice | 584.22 mi (940.21 km) |
| Mariehamn to Parczew | 595.79 mi (958.84 km) |
