| Upper Grand Lagoon to Oberkirch | 4,851.76 mi (7,808.16 km) |
| Upper Grand Lagoon to Obernburg am Main | 4,859.25 mi (7,820.21 km) |
| Upper Grand Lagoon to Obernkirchen | 4,791.70 mi (7,711.50 km) |
| Upper Grand Lagoon to Oberschleissheim | 5,005.10 mi (8,054.92 km) |
| Upper Grand Lagoon to Oberstdorf | 4,976.35 mi (8,008.66 km) |
| Upper Grand Lagoon to Obertraubling | 5,008.05 mi (8,059.68 km) |
| Upper Grand Lagoon to Obertshausen | 4,840.42 mi (7,789.90 km) |
| Upper Grand Lagoon to Oberursel | 4,826.24 mi (7,767.09 km) |
| Upper Grand Lagoon to Ochsenfurt | 4,902.32 mi (7,889.52 km) |
| Upper Grand Lagoon to Ochsenhausen | 4,942.99 mi (7,954.97 km) |
| Upper Grand Lagoon to Ochtrup | 4,717.85 mi (7,592.65 km) |
| Upper Grand Lagoon to Odenthal | 4,745.07 mi (7,636.45 km) |
| Upper Grand Lagoon to Oelde | 4,765.33 mi (7,669.06 km) |
| Upper Grand Lagoon to Oelsnitz | 4,964.26 mi (7,989.20 km) |
| Upper Grand Lagoon to Oer-Erkenschwick | 4,734.69 mi (7,619.75 km) |
