| Tortona to Noventa Vicentina | 132.87 mi (213.84 km) |
| Tortona to Novi di Modena | 99.62 mi (160.33 km) |
| Tortona to Novi Ligure | 10.12 mi (16.28 km) |
| Tortona to Nuoro | 317.17 mi (510.43 km) |
| Tortona to Occhiobello | 132.89 mi (213.87 km) |
| Tortona to Oderzo | 186.49 mi (300.13 km) |
| Tortona to Oggiono | 65.78 mi (105.86 km) |
| Tortona to Olbia | 276.69 mi (445.28 km) |
| Tortona to Oleggio | 50.06 mi (80.56 km) |
| Tortona to Olgiate Comasco | 61.63 mi (99.18 km) |
| Tortona to Olgiate Olona | 51.07 mi (82.20 km) |
| Tortona to Omegna | 71.53 mi (115.12 km) |
| Tortona to Opera | 37.88 mi (60.96 km) |
| Tortona to Oppeano | 116.46 mi (187.43 km) |
| Tortona to Orbassano | 65.44 mi (105.31 km) |
