| Frondenberg to Obernburg am Main | 127.84 mi (205.74 km) |
| Frondenberg to Obernkirchen | 79.62 mi (128.14 km) |
| Frondenberg to Oberschleissheim | 279.59 mi (449.96 km) |
| Frondenberg to Oberstdorf | 302.49 mi (486.81 km) |
| Frondenberg to Obertraubling | 260.38 mi (419.04 km) |
| Frondenberg to Obertshausen | 107.71 mi (173.35 km) |
| Frondenberg to Oberursel | 94.53 mi (152.12 km) |
| Frondenberg to Ochsenfurt | 161.37 mi (259.70 km) |
| Frondenberg to Ochsenhausen | 254.25 mi (409.18 km) |
| Frondenberg to Ochtrup | 56.33 mi (90.66 km) |
| Frondenberg to Odenthal | 41.31 mi (66.48 km) |
| Frondenberg to Oelde | 29.91 mi (48.14 km) |
| Frondenberg to Oelsnitz | 204.95 mi (329.84 km) |
| Frondenberg to Oer-Erkenschwick | 25.06 mi (40.33 km) |
| Frondenberg to Oerlinghausen | 51.53 mi (82.94 km) |
