| Grays to Oberkirch | 399.52 mi (642.97 km) |
| Grays to Obernburg am Main | 401.86 mi (646.74 km) |
| Grays to Obernkirchen | 378.62 mi (609.33 km) |
| Grays to Oberschleissheim | 547.09 mi (880.46 km) |
| Grays to Oberstdorf | 527.22 mi (848.48 km) |
| Grays to Obertraubling | 550.53 mi (885.99 km) |
| Grays to Obertshausen | 383.84 mi (617.74 km) |
| Grays to Oberursel | 370.18 mi (595.75 km) |
| Grays to Ochsenfurt | 445.18 mi (716.44 km) |
| Grays to Ochsenhausen | 488.81 mi (786.66 km) |
| Grays to Ochtrup | 297.06 mi (478.08 km) |
| Grays to Odenthal | 294.95 mi (474.68 km) |
| Grays to Oelde | 335.96 mi (540.68 km) |
| Grays to Oelsnitz | 519.86 mi (836.63 km) |
| Grays to Oer-Erkenschwick | 297.40 mi (478.63 km) |
