| Round Lake to Oberkirch | 4,361.85 mi (7,019.72 km) |
| Round Lake to Obernburg am Main | 4,349.98 mi (7,000.62 km) |
| Round Lake to Obernkirchen | 4,255.23 mi (6,848.13 km) |
| Round Lake to Oberschleissheim | 4,503.23 mi (7,247.24 km) |
| Round Lake to Oberstdorf | 4,489.61 mi (7,225.33 km) |
| Round Lake to Obertraubling | 4,495.71 mi (7,235.15 km) |
| Round Lake to Obertshausen | 4,329.82 mi (6,968.18 km) |
| Round Lake to Oberursel | 4,315.13 mi (6,944.53 km) |
| Round Lake to Ochsenfurt | 4,391.37 mi (7,067.23 km) |
| Round Lake to Ochsenhausen | 4,450.27 mi (7,162.02 km) |
| Round Lake to Ochtrup | 4,189.08 mi (6,741.67 km) |
| Round Lake to Odenthal | 4,230.10 mi (6,807.69 km) |
| Round Lake to Oelde | 4,237.31 mi (6,819.30 km) |
| Round Lake to Oelsnitz | 4,436.22 mi (7,139.40 km) |
| Round Lake to Oer-Erkenschwick | 4,212.18 mi (6,778.86 km) |
