| Slough to Noventa Vicentina | 701.52 mi (1,128.98 km) |
| Slough to Novi di Modena | 697.74 mi (1,122.90 km) |
| Slough to Novi Ligure | 634.85 mi (1,021.70 km) |
| Slough to Nuoro | 906.69 mi (1,459.18 km) |
| Slough to Occhiobello | 720.22 mi (1,159.08 km) |
| Slough to Oderzo | 714.77 mi (1,150.31 km) |
| Slough to Oggiono | 600.98 mi (967.18 km) |
| Slough to Olbia | 874.67 mi (1,407.65 km) |
| Slough to Oleggio | 586.11 mi (943.26 km) |
| Slough to Olgiate Comasco | 587.97 mi (946.25 km) |
| Slough to Olgiate Olona | 592.66 mi (953.80 km) |
| Slough to Omegna | 564.60 mi (908.64 km) |
| Slough to Opera | 616.30 mi (991.84 km) |
| Slough to Oppeano | 688.19 mi (1,107.53 km) |
| Slough to Orbassano | 583.62 mi (939.25 km) |
