| Piatra Neamt to Oerlinghausen | 865.29 mi (1,392.54 km) |
| Piatra Neamt to Oestrich-Winkel | 865.59 mi (1,393.03 km) |
| Piatra Neamt to Offenburg | 861.84 mi (1,387.00 km) |
| Piatra Neamt to Oftersheim | 835.03 mi (1,343.85 km) |
| Piatra Neamt to Ohrdruf | 758.18 mi (1,220.17 km) |
| Piatra Neamt to Ohringen | 792.91 mi (1,276.07 km) |
| Piatra Neamt to Olbernhau | 646.05 mi (1,039.71 km) |
| Piatra Neamt to Olching | 706.18 mi (1,136.48 km) |
| Piatra Neamt to Oldenburg | 909.52 mi (1,463.73 km) |
| Piatra Neamt to Oldenburg in Holstein | 845.81 mi (1,361.20 km) |
| Piatra Neamt to Olfen | 913.62 mi (1,470.33 km) |
| Piatra Neamt to Olpe | 884.14 mi (1,422.89 km) |
| Piatra Neamt to Olsberg | 861.67 mi (1,386.73 km) |
| Piatra Neamt to Oranienburg | 708.64 mi (1,140.45 km) |
| Piatra Neamt to Ortenberg | 823.08 mi (1,324.61 km) |
