| Houthulst to Obernburg am Main | 283.62 mi (456.44 km) |
| Houthulst to Obernkirchen | 279.01 mi (449.03 km) |
| Houthulst to Oberschleissheim | 428.96 mi (690.35 km) |
| Houthulst to Oberstdorf | 412.35 mi (663.61 km) |
| Houthulst to Obertraubling | 432.17 mi (695.50 km) |
| Houthulst to Obertshausen | 265.90 mi (427.92 km) |
| Houthulst to Oberursel | 252.47 mi (406.31 km) |
| Houthulst to Ochsenfurt | 326.96 mi (526.19 km) |
| Houthulst to Ochsenhausen | 372.33 mi (599.21 km) |
| Houthulst to Ochtrup | 200.73 mi (323.05 km) |
| Houthulst to Odenthal | 181.14 mi (291.52 km) |
| Houthulst to Oelde | 231.70 mi (372.88 km) |
| Houthulst to Oelsnitz | 404.93 mi (651.68 km) |
| Houthulst to Oer-Erkenschwick | 191.28 mi (307.83 km) |
| Houthulst to Oerlinghausen | 255.23 mi (410.76 km) |
