| Friendly to Oerlinghausen | 4,008.35 mi (6,450.81 km) |
| Friendly to Oestrich-Winkel | 4,036.90 mi (6,496.76 km) |
| Friendly to Offenburg | 4,078.37 mi (6,563.50 km) |
| Friendly to Oftersheim | 4,078.77 mi (6,564.15 km) |
| Friendly to Ohrdruf | 4,122.02 mi (6,633.75 km) |
| Friendly to Ohringen | 4,121.11 mi (6,632.28 km) |
| Friendly to Olbernhau | 4,228.87 mi (6,805.71 km) |
| Friendly to Olching | 4,226.02 mi (6,801.12 km) |
| Friendly to Oldenburg | 3,958.98 mi (6,371.36 km) |
| Friendly to Oldenburg in Holstein | 4,027.99 mi (6,482.42 km) |
| Friendly to Olfen | 3,964.81 mi (6,380.74 km) |
| Friendly to Olpe | 4,001.73 mi (6,440.16 km) |
| Friendly to Olsberg | 4,018.26 mi (6,466.76 km) |
| Friendly to Oranienburg | 4,160.58 mi (6,695.81 km) |
| Friendly to Ortenberg | 4,069.21 mi (6,548.77 km) |
