| Echelon to Oberkirch | 3,953.56 mi (6,362.64 km) |
| Echelon to Obernburg am Main | 3,958.89 mi (6,371.22 km) |
| Echelon to Obernkirchen | 3,889.51 mi (6,259.55 km) |
| Echelon to Oberschleissheim | 4,105.74 mi (6,607.55 km) |
| Echelon to Oberstdorf | 4,078.84 mi (6,564.26 km) |
| Echelon to Obertraubling | 4,107.62 mi (6,610.58 km) |
| Echelon to Obertshausen | 3,939.91 mi (6,340.67 km) |
| Echelon to Oberursel | 3,925.67 mi (6,317.75 km) |
| Echelon to Ochsenfurt | 4,001.87 mi (6,440.38 km) |
| Echelon to Ochsenhausen | 4,044.61 mi (6,509.18 km) |
| Echelon to Ochtrup | 3,815.93 mi (6,141.15 km) |
| Echelon to Odenthal | 3,844.06 mi (6,186.42 km) |
| Echelon to Oelde | 3,863.49 mi (6,217.69 km) |
| Echelon to Oelsnitz | 4,062.59 mi (6,538.10 km) |
| Echelon to Oer-Erkenschwick | 3,833.14 mi (6,168.84 km) |
