| Monfalcone to Oegstgeest | 602.01 mi (968.84 km) |
| Monfalcone to Oirschot | 543.73 mi (875.05 km) |
| Monfalcone to Oisterwijk | 550.80 mi (886.43 km) |
| Monfalcone to Oldebroek | 573.99 mi (923.75 km) |
| Monfalcone to Oldenzaal | 539.90 mi (868.89 km) |
| Monfalcone to Ommen | 564.01 mi (907.68 km) |
| Monfalcone to Oosterend | 599.66 mi (965.06 km) |
| Monfalcone to Oosterhout | 564.42 mi (908.34 km) |
| Monfalcone to Oosterwolde | 593.36 mi (954.92 km) |
| Monfalcone to Oostzaan | 601.71 mi (968.36 km) |
| Monfalcone to Opmeer | 613.25 mi (986.92 km) |
| Monfalcone to Oss | 549.95 mi (885.06 km) |
| Monfalcone to Oud-Beijerland | 586.98 mi (944.66 km) |
| Monfalcone to Oudenbosch | 572.65 mi (921.59 km) |
| Monfalcone to Oudewater | 581.79 mi (936.30 km) |
