| Heerlen to Noventa Vicentina | 463.75 mi (746.33 km) |
| Heerlen to Novi di Modena | 472.18 mi (759.91 km) |
| Heerlen to Novi Ligure | 442.57 mi (712.25 km) |
| Heerlen to Nuoro | 747.62 mi (1,203.18 km) |
| Heerlen to Occhiobello | 486.41 mi (782.80 km) |
| Heerlen to Oderzo | 461.91 mi (743.37 km) |
| Heerlen to Oggiono | 384.71 mi (619.13 km) |
| Heerlen to Olbia | 708.87 mi (1,140.81 km) |
| Heerlen to Oleggio | 384.80 mi (619.28 km) |
| Heerlen to Olgiate Comasco | 378.00 mi (608.34 km) |
| Heerlen to Olgiate Olona | 386.41 mi (621.87 km) |
| Heerlen to Omegna | 363.22 mi (584.54 km) |
| Heerlen to Opera | 408.11 mi (656.80 km) |
| Heerlen to Oppeano | 454.06 mi (730.74 km) |
| Heerlen to Orbassano | 412.28 mi (663.51 km) |
