| King of Prussia to Oerlinghausen | 3,883.63 mi (6,250.10 km) |
| King of Prussia to Oestrich-Winkel | 3,912.69 mi (6,296.86 km) |
| King of Prussia to Offenburg | 3,954.64 mi (6,364.38 km) |
| King of Prussia to Oftersheim | 3,954.69 mi (6,364.46 km) |
| King of Prussia to Ohrdruf | 3,997.41 mi (6,433.21 km) |
| King of Prussia to Ohringen | 3,996.99 mi (6,432.54 km) |
| King of Prussia to Olbernhau | 4,104.13 mi (6,604.97 km) |
| King of Prussia to Olching | 4,102.02 mi (6,601.56 km) |
| King of Prussia to Oldenburg | 3,834.09 mi (6,170.36 km) |
| King of Prussia to Oldenburg in Holstein | 3,902.91 mi (6,281.13 km) |
| King of Prussia to Olfen | 3,840.21 mi (6,180.22 km) |
| King of Prussia to Olpe | 3,877.26 mi (6,239.85 km) |
| King of Prussia to Olsberg | 3,893.67 mi (6,266.26 km) |
| King of Prussia to Oranienburg | 4,035.58 mi (6,494.63 km) |
| King of Prussia to Ortenberg | 3,944.82 mi (6,348.58 km) |
