| Grado to Oberkirch | 765.64 mi (1,232.17 km) |
| Grado to Obernburg am Main | 846.26 mi (1,361.92 km) |
| Grado to Obernkirchen | 930.94 mi (1,498.20 km) |
| Grado to Oberschleissheim | 910.84 mi (1,465.86 km) |
| Grado to Oberstdorf | 838.69 mi (1,349.74 km) |
| Grado to Obertraubling | 950.87 mi (1,530.28 km) |
| Grado to Obertshausen | 841.08 mi (1,353.59 km) |
| Grado to Oberursel | 835.51 mi (1,344.63 km) |
| Grado to Ochsenfurt | 878.33 mi (1,413.53 km) |
| Grado to Ochsenhausen | 835.74 mi (1,344.99 km) |
| Grado to Ochtrup | 863.57 mi (1,389.78 km) |
| Grado to Odenthal | 811.68 mi (1,306.28 km) |
| Grado to Oelde | 880.08 mi (1,416.36 km) |
| Grado to Oelsnitz | 984.80 mi (1,584.88 km) |
| Grado to Oer-Erkenschwick | 841.34 mi (1,354.01 km) |
