| Tortum to Nuth | 1,854.41 mi (2,984.38 km) |
| Tortum to Oegstgeest | 1,929.26 mi (3,104.84 km) |
| Tortum to Oirschot | 1,885.99 mi (3,035.21 km) |
| Tortum to Oisterwijk | 1,891.21 mi (3,043.61 km) |
| Tortum to Oldebroek | 1,873.49 mi (3,015.09 km) |
| Tortum to Oldenzaal | 1,828.95 mi (2,943.41 km) |
| Tortum to Ommen | 1,853.27 mi (2,982.55 km) |
| Tortum to Oosterend | 1,875.21 mi (3,017.86 km) |
| Tortum to Oosterhout | 1,906.42 mi (3,068.08 km) |
| Tortum to Oosterwolde | 1,865.90 mi (3,002.88 km) |
| Tortum to Oostzaan | 1,915.18 mi (3,082.19 km) |
| Tortum to Opmeer | 1,916.09 mi (3,083.66 km) |
| Tortum to Oss | 1,880.10 mi (3,025.73 km) |
| Tortum to Oud-Beijerland | 1,927.70 mi (3,102.33 km) |
| Tortum to Oudenbosch | 1,919.90 mi (3,089.78 km) |
