| Grosse Pointe Woods to Oberkirch | 4,158.11 mi (6,691.83 km) |
| Grosse Pointe Woods to Obernburg am Main | 4,151.31 mi (6,680.89 km) |
| Grosse Pointe Woods to Obernkirchen | 4,063.91 mi (6,540.23 km) |
| Grosse Pointe Woods to Oberschleissheim | 4,303.10 mi (6,925.17 km) |
| Grosse Pointe Woods to Oberstdorf | 4,285.50 mi (6,896.85 km) |
| Grosse Pointe Woods to Obertraubling | 4,298.38 mi (6,917.58 km) |
| Grosse Pointe Woods to Obertshausen | 4,131.44 mi (6,648.92 km) |
| Grosse Pointe Woods to Oberursel | 4,116.84 mi (6,625.41 km) |
| Grosse Pointe Woods to Ochsenfurt | 4,193.30 mi (6,748.47 km) |
| Grosse Pointe Woods to Ochsenhausen | 4,247.56 mi (6,835.79 km) |
| Grosse Pointe Woods to Ochtrup | 3,995.29 mi (6,429.79 km) |
| Grosse Pointe Woods to Odenthal | 4,032.57 mi (6,489.79 km) |
| Grosse Pointe Woods to Oelde | 4,043.48 mi (6,507.35 km) |
| Grosse Pointe Woods to Oelsnitz | 4,243.08 mi (6,828.57 km) |
| Grosse Pointe Woods to Oer-Erkenschwick | 4,016.69 mi (6,464.24 km) |
