| Portici to Noventa Vicentina | 339.37 mi (546.16 km) |
| Portici to Novi di Modena | 330.96 mi (532.62 km) |
| Portici to Novi Ligure | 391.53 mi (630.11 km) |
| Portici to Nuoro | 265.09 mi (426.62 km) |
| Portici to Occhiobello | 315.95 mi (508.47 km) |
| Portici to Oderzo | 355.13 mi (571.52 km) |
| Portici to Oggiono | 424.78 mi (683.62 km) |
| Portici to Olbia | 253.00 mi (407.17 km) |
| Portici to Oleggio | 437.61 mi (704.27 km) |
| Portici to Olgiate Comasco | 436.41 mi (702.33 km) |
| Portici to Olgiate Olona | 431.19 mi (693.93 km) |
| Portici to Omegna | 459.13 mi (738.90 km) |
| Portici to Opera | 407.56 mi (655.90 km) |
| Portici to Oppeano | 348.12 mi (560.25 km) |
| Portici to Orbassano | 449.46 mi (723.33 km) |
