| Greenock to Noventa Vicentina | 1,021.57 mi (1,644.05 km) |
| Greenock to Novi di Modena | 1,024.44 mi (1,648.68 km) |
| Greenock to Novi Ligure | 973.45 mi (1,566.62 km) |
| Greenock to Nuoro | 1,255.28 mi (2,020.18 km) |
| Greenock to Occhiobello | 1,042.79 mi (1,678.20 km) |
| Greenock to Oderzo | 1,024.33 mi (1,648.49 km) |
| Greenock to Oggiono | 930.39 mi (1,497.32 km) |
| Greenock to Olbia | 1,222.07 mi (1,966.73 km) |
| Greenock to Oleggio | 920.88 mi (1,482.01 km) |
| Greenock to Olgiate Comasco | 919.65 mi (1,480.03 km) |
| Greenock to Olgiate Olona | 925.83 mi (1,489.97 km) |
| Greenock to Omegna | 898.86 mi (1,446.57 km) |
| Greenock to Opera | 949.22 mi (1,527.62 km) |
| Greenock to Oppeano | 1,010.23 mi (1,625.81 km) |
| Greenock to Orbassano | 926.67 mi (1,491.33 km) |
