| Grosse Pointe Park to Oberkirch | 4,161.83 mi (6,697.83 km) |
| Grosse Pointe Park to Obernburg am Main | 4,155.09 mi (6,686.98 km) |
| Grosse Pointe Park to Obernkirchen | 4,067.77 mi (6,546.44 km) |
| Grosse Pointe Park to Oberschleissheim | 4,306.86 mi (6,931.22 km) |
| Grosse Pointe Park to Oberstdorf | 4,289.22 mi (6,902.83 km) |
| Grosse Pointe Park to Obertraubling | 4,302.18 mi (6,923.68 km) |
| Grosse Pointe Park to Obertshausen | 4,135.23 mi (6,655.01 km) |
| Grosse Pointe Park to Oberursel | 4,120.62 mi (6,631.51 km) |
| Grosse Pointe Park to Ochsenfurt | 4,197.09 mi (6,754.57 km) |
| Grosse Pointe Park to Ochsenhausen | 4,251.29 mi (6,841.80 km) |
| Grosse Pointe Park to Ochtrup | 3,999.12 mi (6,435.97 km) |
| Grosse Pointe Park to Odenthal | 4,036.36 mi (6,495.90 km) |
| Grosse Pointe Park to Oelde | 4,047.31 mi (6,513.52 km) |
| Grosse Pointe Park to Oelsnitz | 4,246.91 mi (6,834.75 km) |
| Grosse Pointe Park to Oer-Erkenschwick | 4,020.51 mi (6,470.39 km) |
