| Harlingen to Noventa Vicentina | 610.30 mi (982.19 km) |
| Harlingen to Novi di Modena | 623.08 mi (1,002.75 km) |
| Harlingen to Novi Ligure | 600.83 mi (966.94 km) |
| Harlingen to Nuoro | 907.02 mi (1,459.71 km) |
| Harlingen to Occhiobello | 634.06 mi (1,020.43 km) |
| Harlingen to Oderzo | 600.61 mi (966.60 km) |
| Harlingen to Oggiono | 539.92 mi (868.92 km) |
| Harlingen to Olbia | 867.94 mi (1,396.82 km) |
| Harlingen to Oleggio | 542.64 mi (873.30 km) |
| Harlingen to Olgiate Comasco | 534.60 mi (860.36 km) |
| Harlingen to Olgiate Olona | 543.50 mi (874.67 km) |
| Harlingen to Omegna | 521.36 mi (839.05 km) |
| Harlingen to Opera | 564.50 mi (908.48 km) |
| Harlingen to Oppeano | 602.34 mi (969.37 km) |
| Harlingen to Orbassano | 572.19 mi (920.85 km) |
