| Northbrook to Oberkirch | 4,361.62 mi (7,019.35 km) |
| Northbrook to Obernburg am Main | 4,350.33 mi (7,001.18 km) |
| Northbrook to Obernkirchen | 4,256.38 mi (6,849.98 km) |
| Northbrook to Oberschleissheim | 4,503.43 mi (7,247.57 km) |
| Northbrook to Oberstdorf | 4,489.35 mi (7,224.91 km) |
| Northbrook to Obertraubling | 4,496.23 mi (7,235.99 km) |
| Northbrook to Obertshausen | 4,330.20 mi (6,968.79 km) |
| Northbrook to Oberursel | 4,315.51 mi (6,945.15 km) |
| Northbrook to Ochsenfurt | 4,391.80 mi (7,067.91 km) |
| Northbrook to Ochsenhausen | 4,450.17 mi (7,161.85 km) |
| Northbrook to Ochtrup | 4,189.95 mi (6,743.07 km) |
| Northbrook to Odenthal | 4,230.56 mi (6,808.43 km) |
| Northbrook to Oelde | 4,238.19 mi (6,820.70 km) |
| Northbrook to Oelsnitz | 4,437.19 mi (7,140.97 km) |
| Northbrook to Oer-Erkenschwick | 4,212.87 mi (6,779.96 km) |
