| Glenmont to Oberkirch | 4,072.39 mi (6,553.87 km) |
| Glenmont to Obernburg am Main | 4,076.84 mi (6,561.03 km) |
| Glenmont to Obernkirchen | 4,005.92 mi (6,446.91 km) |
| Glenmont to Oberschleissheim | 4,224.12 mi (6,798.06 km) |
| Glenmont to Oberstdorf | 4,197.86 mi (6,755.81 km) |
| Glenmont to Obertraubling | 4,225.51 mi (6,800.31 km) |
| Glenmont to Obertshausen | 4,057.77 mi (6,530.36 km) |
| Glenmont to Oberursel | 4,043.50 mi (6,507.38 km) |
| Glenmont to Ochsenfurt | 4,119.76 mi (6,630.11 km) |
| Glenmont to Ochsenhausen | 4,163.37 mi (6,700.29 km) |
| Glenmont to Ochtrup | 3,932.73 mi (6,329.12 km) |
| Glenmont to Odenthal | 3,961.64 mi (6,375.64 km) |
| Glenmont to Oelde | 3,980.37 mi (6,405.79 km) |
| Glenmont to Oelsnitz | 4,179.63 mi (6,726.46 km) |
| Glenmont to Oer-Erkenschwick | 3,950.31 mi (6,357.40 km) |
