| Gretz-Armainvilliers to Obernburg am Main | 298.45 mi (480.30 km) |
| Gretz-Armainvilliers to Obernkirchen | 371.27 mi (597.50 km) |
| Gretz-Armainvilliers to Oberschleissheim | 405.60 mi (652.75 km) |
| Gretz-Armainvilliers to Oberstdorf | 360.09 mi (579.50 km) |
| Gretz-Armainvilliers to Obertraubling | 428.84 mi (690.15 km) |
| Gretz-Armainvilliers to Obertshausen | 289.01 mi (465.12 km) |
| Gretz-Armainvilliers to Oberursel | 281.01 mi (452.25 km) |
| Gretz-Armainvilliers to Ochsenfurt | 336.83 mi (542.07 km) |
| Gretz-Armainvilliers to Ochsenhausen | 333.96 mi (537.46 km) |
| Gretz-Armainvilliers to Ochtrup | 309.23 mi (497.65 km) |
| Gretz-Armainvilliers to Odenthal | 251.21 mi (404.28 km) |
| Gretz-Armainvilliers to Oelde | 320.48 mi (515.77 km) |
| Gretz-Armainvilliers to Oelsnitz | 437.81 mi (704.58 km) |
| Gretz-Armainvilliers to Oer-Erkenschwick | 282.91 mi (455.30 km) |
| Gretz-Armainvilliers to Oerlinghausen | 343.42 mi (552.68 km) |
