| Troina to Oegstgeest | 1,108.90 mi (1,784.60 km) |
| Troina to Oirschot | 1,050.27 mi (1,690.24 km) |
| Troina to Oisterwijk | 1,057.39 mi (1,701.70 km) |
| Troina to Oldebroek | 1,096.68 mi (1,764.94 km) |
| Troina to Oldenzaal | 1,070.17 mi (1,722.27 km) |
| Troina to Ommen | 1,091.61 mi (1,756.77 km) |
| Troina to Oosterend | 1,128.29 mi (1,815.81 km) |
| Troina to Oosterhout | 1,068.27 mi (1,719.22 km) |
| Troina to Oosterwolde | 1,123.60 mi (1,808.25 km) |
| Troina to Oostzaan | 1,115.29 mi (1,794.89 km) |
| Troina to Opmeer | 1,130.18 mi (1,818.85 km) |
| Troina to Oss | 1,061.99 mi (1,709.12 km) |
| Troina to Oud-Beijerland | 1,088.54 mi (1,751.84 km) |
| Troina to Oudenbosch | 1,072.34 mi (1,725.77 km) |
| Troina to Oudewater | 1,090.47 mi (1,754.94 km) |
