| Trecastagni to Oegstgeest | 1,129.93 mi (1,818.44 km) |
| Trecastagni to Oirschot | 1,071.17 mi (1,723.88 km) |
| Trecastagni to Oisterwijk | 1,078.30 mi (1,735.36 km) |
| Trecastagni to Oldebroek | 1,116.56 mi (1,796.93 km) |
| Trecastagni to Oldenzaal | 1,089.36 mi (1,753.15 km) |
| Trecastagni to Ommen | 1,111.07 mi (1,788.10 km) |
| Trecastagni to Oosterend | 1,147.74 mi (1,847.11 km) |
| Trecastagni to Oosterhout | 1,089.38 mi (1,753.19 km) |
| Trecastagni to Oosterwolde | 1,142.89 mi (1,839.30 km) |
| Trecastagni to Oostzaan | 1,135.89 mi (1,828.04 km) |
| Trecastagni to Opmeer | 1,150.57 mi (1,851.66 km) |
| Trecastagni to Oss | 1,082.57 mi (1,742.23 km) |
| Trecastagni to Oud-Beijerland | 1,109.85 mi (1,786.13 km) |
| Trecastagni to Oudenbosch | 1,093.71 mi (1,760.16 km) |
| Trecastagni to Oudewater | 1,111.34 mi (1,788.53 km) |
