| Barreiro to Noventa Vicentina | 1,148.47 mi (1,848.29 km) |
| Barreiro to Novi di Modena | 1,111.40 mi (1,788.63 km) |
| Barreiro to Novi Ligure | 1,009.59 mi (1,624.78 km) |
| Barreiro to Nuoro | 985.89 mi (1,586.64 km) |
| Barreiro to Occhiobello | 1,144.01 mi (1,841.11 km) |
| Barreiro to Oderzo | 1,202.70 mi (1,935.56 km) |
| Barreiro to Oggiono | 1,059.36 mi (1,704.87 km) |
| Barreiro to Olbia | 995.94 mi (1,602.80 km) |
| Barreiro to Oleggio | 1,022.53 mi (1,645.60 km) |
| Barreiro to Olgiate Comasco | 1,042.16 mi (1,677.20 km) |
| Barreiro to Olgiate Olona | 1,034.61 mi (1,665.05 km) |
| Barreiro to Omegna | 1,019.74 mi (1,641.11 km) |
| Barreiro to Opera | 1,043.63 mi (1,679.56 km) |
| Barreiro to Oppeano | 1,132.48 mi (1,822.56 km) |
| Barreiro to Orbassano | 957.94 mi (1,541.65 km) |
