| Boone to Oberkirch | 4,392.67 mi (7,069.32 km) |
| Boone to Obernburg am Main | 4,396.49 mi (7,075.47 km) |
| Boone to Obernkirchen | 4,324.12 mi (6,959.00 km) |
| Boone to Oberschleissheim | 4,544.11 mi (7,313.04 km) |
| Boone to Oberstdorf | 4,518.26 mi (7,271.43 km) |
| Boone to Obertraubling | 4,545.11 mi (7,314.66 km) |
| Boone to Obertshausen | 4,377.37 mi (7,044.69 km) |
| Boone to Oberursel | 4,363.06 mi (7,021.67 km) |
| Boone to Ochsenfurt | 4,439.36 mi (7,144.47 km) |
| Boone to Ochsenhausen | 4,483.61 mi (7,215.67 km) |
| Boone to Ochtrup | 4,251.35 mi (6,841.88 km) |
| Boone to Odenthal | 4,280.99 mi (6,889.58 km) |
| Boone to Oelde | 4,299.07 mi (6,918.68 km) |
| Boone to Oelsnitz | 4,498.45 mi (7,239.56 km) |
| Boone to Oer-Erkenschwick | 4,269.28 mi (6,870.74 km) |
