| Gloucester to Noventa Vicentina | 774.78 mi (1,246.90 km) |
| Gloucester to Novi di Modena | 769.98 mi (1,239.16 km) |
| Gloucester to Novi Ligure | 704.19 mi (1,133.29 km) |
| Gloucester to Nuoro | 969.23 mi (1,559.82 km) |
| Gloucester to Occhiobello | 793.10 mi (1,276.36 km) |
| Gloucester to Oderzo | 789.08 mi (1,269.89 km) |
| Gloucester to Oggiono | 672.97 mi (1,083.04 km) |
| Gloucester to Olbia | 938.47 mi (1,510.33 km) |
| Gloucester to Oleggio | 656.86 mi (1,057.12 km) |
| Gloucester to Olgiate Comasco | 659.51 mi (1,061.38 km) |
| Gloucester to Olgiate Olona | 663.82 mi (1,068.31 km) |
| Gloucester to Omegna | 635.58 mi (1,022.86 km) |
| Gloucester to Opera | 687.44 mi (1,106.33 km) |
| Gloucester to Oppeano | 761.21 mi (1,225.05 km) |
| Gloucester to Orbassano | 651.22 mi (1,048.03 km) |
