| Alenquer to Noventa Vicentina | 1,133.08 mi (1,823.52 km) |
| Alenquer to Novi di Modena | 1,096.36 mi (1,764.42 km) |
| Alenquer to Novi Ligure | 994.12 mi (1,599.88 km) |
| Alenquer to Nuoro | 977.88 mi (1,573.75 km) |
| Alenquer to Occhiobello | 1,129.10 mi (1,817.12 km) |
| Alenquer to Oderzo | 1,186.92 mi (1,910.17 km) |
| Alenquer to Oggiono | 1,042.68 mi (1,678.02 km) |
| Alenquer to Olbia | 986.86 mi (1,588.20 km) |
| Alenquer to Oleggio | 1,005.84 mi (1,618.74 km) |
| Alenquer to Olgiate Comasco | 1,025.35 mi (1,650.14 km) |
| Alenquer to Olgiate Olona | 1,017.97 mi (1,638.26 km) |
| Alenquer to Omegna | 1,002.60 mi (1,613.53 km) |
| Alenquer to Opera | 1,027.43 mi (1,653.49 km) |
| Alenquer to Oppeano | 1,116.98 mi (1,797.60 km) |
| Alenquer to Orbassano | 941.66 mi (1,515.45 km) |
