| Os to Noventa Vicentina | 1,062.04 mi (1,709.19 km) |
| Os to Novi di Modena | 1,082.78 mi (1,742.57 km) |
| Os to Novi Ligure | 1,077.41 mi (1,733.92 km) |
| Os to Nuoro | 1,385.60 mi (2,229.91 km) |
| Os to Occhiobello | 1,087.00 mi (1,749.36 km) |
| Os to Oderzo | 1,038.49 mi (1,671.29 km) |
| Os to Oggiono | 1,010.44 mi (1,626.15 km) |
| Os to Olbia | 1,345.24 mi (2,164.95 km) |
| Os to Oleggio | 1,018.86 mi (1,639.69 km) |
| Os to Olgiate Comasco | 1,008.10 mi (1,622.39 km) |
| Os to Olgiate Olona | 1,017.92 mi (1,638.18 km) |
| Os to Omegna | 998.60 mi (1,607.10 km) |
| Os to Opera | 1,037.01 mi (1,668.91 km) |
| Os to Oppeano | 1,057.63 mi (1,702.10 km) |
| Os to Orbassano | 1,054.99 mi (1,697.85 km) |
