| Holyhead to Noventa Vicentina | 911.98 mi (1,467.69 km) |
| Holyhead to Novi di Modena | 908.70 mi (1,462.41 km) |
| Holyhead to Novi Ligure | 845.02 mi (1,359.92 km) |
| Holyhead to Nuoro | 1,110.21 mi (1,786.72 km) |
| Holyhead to Occhiobello | 930.95 mi (1,498.22 km) |
| Holyhead to Oderzo | 923.65 mi (1,486.48 km) |
| Holyhead to Oggiono | 811.97 mi (1,306.75 km) |
| Holyhead to Olbia | 1,079.74 mi (1,737.67 km) |
| Holyhead to Oleggio | 796.92 mi (1,282.53 km) |
| Holyhead to Olgiate Comasco | 798.95 mi (1,285.79 km) |
| Holyhead to Olgiate Olona | 803.58 mi (1,293.24 km) |
| Holyhead to Omegna | 775.48 mi (1,248.01 km) |
| Holyhead to Opera | 827.23 mi (1,331.29 km) |
| Holyhead to Oppeano | 898.84 mi (1,446.54 km) |
| Holyhead to Orbassano | 792.52 mi (1,275.44 km) |
