| Heiloo to Noventa Vicentina | 592.08 mi (952.86 km) |
| Heiloo to Novi di Modena | 601.90 mi (968.66 km) |
| Heiloo to Novi Ligure | 572.43 mi (921.24 km) |
| Heiloo to Nuoro | 876.21 mi (1,410.13 km) |
| Heiloo to Occhiobello | 615.16 mi (990.01 km) |
| Heiloo to Oderzo | 586.90 mi (944.52 km) |
| Heiloo to Oggiono | 515.10 mi (828.97 km) |
| Heiloo to Olbia | 837.91 mi (1,348.49 km) |
| Heiloo to Oleggio | 514.89 mi (828.63 km) |
| Heiloo to Olgiate Comasco | 508.36 mi (818.13 km) |
| Heiloo to Olgiate Olona | 516.70 mi (831.54 km) |
| Heiloo to Omegna | 493.20 mi (793.73 km) |
| Heiloo to Opera | 538.48 mi (866.61 km) |
| Heiloo to Oppeano | 582.98 mi (938.22 km) |
| Heiloo to Orbassano | 539.96 mi (868.99 km) |
