| Grimstad to Oberkirch | 677.93 mi (1,091.03 km) |
| Grimstad to Obernburg am Main | 587.74 mi (945.88 km) |
| Grimstad to Obernkirchen | 420.18 mi (676.22 km) |
| Grimstad to Oberschleissheim | 707.74 mi (1,138.99 km) |
| Grimstad to Oberstdorf | 758.45 mi (1,220.60 km) |
| Grimstad to Obertraubling | 663.81 mi (1,068.31 km) |
| Grimstad to Obertshausen | 571.75 mi (920.14 km) |
| Grimstad to Oberursel | 562.23 mi (904.82 km) |
| Grimstad to Ochsenfurt | 603.39 mi (971.06 km) |
| Grimstad to Ochsenhausen | 711.64 mi (1,145.28 km) |
| Grimstad to Ochtrup | 427.44 mi (687.90 km) |
| Grimstad to Odenthal | 508.28 mi (818.00 km) |
| Grimstad to Oelde | 449.94 mi (724.11 km) |
| Grimstad to Oelsnitz | 565.85 mi (910.64 km) |
| Grimstad to Oer-Erkenschwick | 465.83 mi (749.69 km) |
