| Formia to Oberkirch | 570.09 mi (917.46 km) |
| Formia to Obernburg am Main | 630.39 mi (1,014.52 km) |
| Formia to Obernkirchen | 788.87 mi (1,269.57 km) |
| Formia to Oberschleissheim | 492.82 mi (793.12 km) |
| Formia to Oberstdorf | 455.24 mi (732.64 km) |
| Formia to Obertraubling | 536.60 mi (863.58 km) |
| Formia to Obertshausen | 650.06 mi (1,046.18 km) |
| Formia to Oberursel | 663.18 mi (1,067.29 km) |
| Formia to Ochsenfurt | 604.06 mi (972.14 km) |
| Formia to Ochsenhausen | 503.43 mi (810.19 km) |
| Formia to Ochtrup | 813.98 mi (1,309.97 km) |
| Formia to Odenthal | 742.37 mi (1,194.73 km) |
| Formia to Oelde | 774.36 mi (1,246.21 km) |
| Formia to Oelsnitz | 636.01 mi (1,023.56 km) |
| Formia to Oer-Erkenschwick | 777.56 mi (1,251.36 km) |
