| Gardelegen to Obernburg am Main | 209.63 mi (337.37 km) |
| Gardelegen to Obernkirchen | 97.57 mi (157.02 km) |
| Gardelegen to Oberschleissheim | 295.57 mi (475.67 km) |
| Gardelegen to Oberstdorf | 356.96 mi (574.48 km) |
| Gardelegen to Obertraubling | 248.33 mi (399.65 km) |
| Gardelegen to Obertshausen | 202.72 mi (326.25 km) |
| Gardelegen to Oberursel | 201.25 mi (323.89 km) |
| Gardelegen to Ochsenfurt | 206.89 mi (332.96 km) |
| Gardelegen to Ochsenhausen | 314.27 mi (505.77 km) |
| Gardelegen to Ochtrup | 178.64 mi (287.50 km) |
| Gardelegen to Odenthal | 209.83 mi (337.69 km) |
| Gardelegen to Oelde | 145.47 mi (234.11 km) |
| Gardelegen to Oelsnitz | 149.52 mi (240.63 km) |
| Gardelegen to Oer-Erkenschwick | 186.13 mi (299.54 km) |
| Gardelegen to Oerlinghausen | 121.61 mi (195.72 km) |
