| Echelon to Oerlinghausen | 3,880.12 mi (6,244.46 km) |
| Echelon to Oestrich-Winkel | 3,908.09 mi (6,289.47 km) |
| Echelon to Offenburg | 3,949.28 mi (6,355.75 km) |
| Echelon to Oftersheim | 3,949.87 mi (6,356.70 km) |
| Echelon to Ohrdruf | 3,993.63 mi (6,427.12 km) |
| Echelon to Ohringen | 3,992.23 mi (6,424.87 km) |
| Echelon to Olbernhau | 4,100.67 mi (6,599.39 km) |
| Echelon to Olching | 4,097.06 mi (6,593.58 km) |
| Echelon to Oldenburg | 3,831.13 mi (6,165.60 km) |
| Echelon to Oldenburg in Holstein | 3,900.90 mi (6,277.89 km) |
| Echelon to Olfen | 3,836.40 mi (6,174.09 km) |
| Echelon to Olpe | 3,873.15 mi (6,233.24 km) |
| Echelon to Olsberg | 3,889.83 mi (6,260.07 km) |
| Echelon to Oranienburg | 4,033.11 mi (6,490.66 km) |
| Echelon to Ortenberg | 3,940.56 mi (6,341.72 km) |
