| Opmeer to Noventa Vicentina | 592.46 mi (953.47 km) |
| Opmeer to Novi di Modena | 603.08 mi (970.56 km) |
| Opmeer to Novi Ligure | 575.62 mi (926.37 km) |
| Opmeer to Nuoro | 880.20 mi (1,416.55 km) |
| Opmeer to Occhiobello | 615.74 mi (990.93 km) |
| Opmeer to Oderzo | 586.11 mi (943.25 km) |
| Opmeer to Oggiono | 517.23 mi (832.40 km) |
| Opmeer to Olbia | 841.67 mi (1,354.53 km) |
| Opmeer to Oleggio | 517.86 mi (833.41 km) |
| Opmeer to Olgiate Comasco | 510.89 mi (822.20 km) |
| Opmeer to Olgiate Olona | 519.39 mi (835.88 km) |
| Opmeer to Omegna | 496.28 mi (798.68 km) |
| Opmeer to Opera | 540.97 mi (870.60 km) |
| Opmeer to Oppeano | 583.66 mi (939.31 km) |
| Opmeer to Orbassano | 544.27 mi (875.92 km) |
