| Piatra Neamt to Oberkirch | 855.00 mi (1,375.99 km) |
| Piatra Neamt to Obernburg am Main | 813.81 mi (1,309.70 km) |
| Piatra Neamt to Obernkirchen | 853.36 mi (1,373.35 km) |
| Piatra Neamt to Oberschleissheim | 694.78 mi (1,118.15 km) |
| Piatra Neamt to Oberstdorf | 755.25 mi (1,215.46 km) |
| Piatra Neamt to Obertraubling | 671.21 mi (1,080.21 km) |
| Piatra Neamt to Obertshausen | 829.57 mi (1,335.06 km) |
| Piatra Neamt to Oberursel | 842.20 mi (1,355.39 km) |
| Piatra Neamt to Ochsenfurt | 771.10 mi (1,240.96 km) |
| Piatra Neamt to Ochsenhausen | 769.18 mi (1,237.88 km) |
| Piatra Neamt to Ochtrup | 930.09 mi (1,496.83 km) |
| Piatra Neamt to Odenthal | 914.93 mi (1,472.44 km) |
| Piatra Neamt to Oelde | 883.91 mi (1,422.52 km) |
| Piatra Neamt to Oelsnitz | 690.14 mi (1,110.67 km) |
| Piatra Neamt to Oer-Erkenschwick | 917.94 mi (1,477.28 km) |
