| Portalegre to Noventa Vicentina | 1,049.25 mi (1,688.61 km) |
| Portalegre to Novi di Modena | 1,012.12 mi (1,628.84 km) |
| Portalegre to Novi Ligure | 910.40 mi (1,465.15 km) |
| Portalegre to Nuoro | 890.27 mi (1,432.76 km) |
| Portalegre to Occhiobello | 1,044.71 mi (1,681.30 km) |
| Portalegre to Oderzo | 1,103.58 mi (1,776.05 km) |
| Portalegre to Oggiono | 960.65 mi (1,546.02 km) |
| Portalegre to Olbia | 899.22 mi (1,447.15 km) |
| Portalegre to Oleggio | 923.84 mi (1,486.77 km) |
| Portalegre to Olgiate Comasco | 943.54 mi (1,518.48 km) |
| Portalegre to Olgiate Olona | 935.90 mi (1,506.18 km) |
| Portalegre to Omegna | 921.33 mi (1,482.74 km) |
| Portalegre to Opera | 944.69 mi (1,520.32 km) |
| Portalegre to Oppeano | 1,033.29 mi (1,662.92 km) |
| Portalegre to Orbassano | 859.04 mi (1,382.49 km) |
