| Tortum to Oerlinghausen | 1,751.82 mi (2,819.28 km) |
| Tortum to Oestrich-Winkel | 1,752.21 mi (2,819.91 km) |
| Tortum to Offenburg | 1,740.69 mi (2,801.37 km) |
| Tortum to Oftersheim | 1,719.50 mi (2,767.27 km) |
| Tortum to Ohrdruf | 1,646.15 mi (2,649.23 km) |
| Tortum to Ohringen | 1,676.91 mi (2,698.73 km) |
| Tortum to Olbernhau | 1,533.62 mi (2,468.13 km) |
| Tortum to Olching | 1,584.22 mi (2,549.56 km) |
| Tortum to Oldenburg | 1,791.50 mi (2,883.14 km) |
| Tortum to Oldenburg in Holstein | 1,714.07 mi (2,758.53 km) |
| Tortum to Olfen | 1,801.15 mi (2,898.67 km) |
| Tortum to Olpe | 1,772.18 mi (2,852.05 km) |
| Tortum to Olsberg | 1,749.49 mi (2,815.53 km) |
| Tortum to Oranienburg | 1,584.91 mi (2,550.66 km) |
| Tortum to Ortenberg | 1,710.73 mi (2,753.15 km) |
