| Mentana to Oberkirch | 501.80 mi (807.56 km) |
| Mentana to Obernburg am Main | 566.06 mi (910.98 km) |
| Mentana to Obernkirchen | 727.15 mi (1,170.24 km) |
| Mentana to Oberschleissheim | 433.89 mi (698.28 km) |
| Mentana to Oberstdorf | 390.33 mi (628.17 km) |
| Mentana to Obertraubling | 480.70 mi (773.62 km) |
| Mentana to Obertshausen | 585.34 mi (942.02 km) |
| Mentana to Oberursel | 598.11 mi (962.56 km) |
| Mentana to Ochsenfurt | 541.78 mi (871.92 km) |
| Mentana to Ochsenhausen | 438.62 mi (705.89 km) |
| Mentana to Ochtrup | 748.80 mi (1,205.08 km) |
| Mentana to Odenthal | 675.76 mi (1,087.54 km) |
| Mentana to Oelde | 710.37 mi (1,143.23 km) |
| Mentana to Oelsnitz | 580.84 mi (934.77 km) |
| Mentana to Oer-Erkenschwick | 711.86 mi (1,145.62 km) |
