| Huntsville to Oberkirch | 4,667.91 mi (7,512.28 km) |
| Huntsville to Obernburg am Main | 4,668.33 mi (7,512.95 km) |
| Huntsville to Obernkirchen | 4,590.54 mi (7,387.77 km) |
| Huntsville to Oberschleissheim | 4,817.49 mi (7,753.00 km) |
| Huntsville to Oberstdorf | 4,794.20 mi (7,715.51 km) |
| Huntsville to Obertraubling | 4,816.60 mi (7,751.57 km) |
| Huntsville to Obertshausen | 4,648.93 mi (7,481.73 km) |
| Huntsville to Oberursel | 4,634.51 mi (7,458.52 km) |
| Huntsville to Ochsenfurt | 4,710.96 mi (7,581.55 km) |
| Huntsville to Ochsenhausen | 4,758.49 mi (7,658.06 km) |
| Huntsville to Ochtrup | 4,519.21 mi (7,272.97 km) |
| Huntsville to Odenthal | 4,551.59 mi (7,325.07 km) |
| Huntsville to Oelde | 4,567.16 mi (7,350.14 km) |
| Huntsville to Oelsnitz | 4,766.86 mi (7,671.52 km) |
| Huntsville to Oer-Erkenschwick | 4,538.41 mi (7,303.87 km) |
