| Castelletto sopra Ticino to Oegstgeest | 484.95 mi (780.45 km) |
| Castelletto sopra Ticino to Oirschot | 427.50 mi (688.00 km) |
| Castelletto sopra Ticino to Oisterwijk | 434.46 mi (699.20 km) |
| Castelletto sopra Ticino to Oldebroek | 481.30 mi (774.57 km) |
| Castelletto sopra Ticino to Oldenzaal | 462.44 mi (744.23 km) |
| Castelletto sopra Ticino to Ommen | 480.35 mi (773.04 km) |
| Castelletto sopra Ticino to Oosterend | 516.47 mi (831.17 km) |
| Castelletto sopra Ticino to Oosterhout | 444.09 mi (714.69 km) |
| Castelletto sopra Ticino to Oosterwolde | 513.42 mi (826.26 km) |
| Castelletto sopra Ticino to Oostzaan | 493.96 mi (794.96 km) |
| Castelletto sopra Ticino to Opmeer | 510.17 mi (821.04 km) |
| Castelletto sopra Ticino to Oss | 441.37 mi (710.31 km) |
| Castelletto sopra Ticino to Oud-Beijerland | 463.27 mi (745.57 km) |
| Castelletto sopra Ticino to Oudenbosch | 446.83 mi (719.10 km) |
| Castelletto sopra Ticino to Oudewater | 467.58 mi (752.50 km) |
