| Porvoo to Obernburg am Main | 973.35 mi (1,566.45 km) |
| Porvoo to Obernkirchen | 842.58 mi (1,356.00 km) |
| Porvoo to Oberschleissheim | 1,008.70 mi (1,623.34 km) |
| Porvoo to Oberstdorf | 1,088.30 mi (1,751.45 km) |
| Porvoo to Obertraubling | 952.15 mi (1,532.33 km) |
| Porvoo to Obertshausen | 968.63 mi (1,558.86 km) |
| Porvoo to Oberursel | 967.80 mi (1,557.52 km) |
| Porvoo to Ochsenfurt | 960.83 mi (1,546.31 km) |
| Porvoo to Ochsenhausen | 1,056.15 mi (1,699.71 km) |
| Porvoo to Ochtrup | 901.15 mi (1,450.26 km) |
| Porvoo to Odenthal | 963.19 mi (1,550.10 km) |
| Porvoo to Oelde | 892.28 mi (1,435.99 km) |
| Porvoo to Oelsnitz | 865.77 mi (1,393.32 km) |
| Porvoo to Oer-Erkenschwick | 927.83 mi (1,493.19 km) |
| Porvoo to Oerlinghausen | 870.77 mi (1,401.37 km) |
