| Douglas to Novi di Modena | 1,005.59 mi (1,618.35 km) |
| Douglas to Novi Ligure | 928.14 mi (1,493.70 km) |
| Douglas to Nuoro | 1,161.58 mi (1,869.38 km) |
| Douglas to Occhiobello | 1,031.66 mi (1,660.29 km) |
| Douglas to Oderzo | 1,036.17 mi (1,667.55 km) |
| Douglas to Oggiono | 908.65 mi (1,462.33 km) |
| Douglas to Olbia | 1,136.27 mi (1,828.66 km) |
| Douglas to Oleggio | 887.42 mi (1,428.17 km) |
| Douglas to Olgiate Comasco | 893.38 mi (1,437.75 km) |
| Douglas to Olgiate Olona | 895.97 mi (1,441.92 km) |
| Douglas to Omegna | 867.46 mi (1,396.04 km) |
| Douglas to Opera | 919.12 mi (1,479.19 km) |
| Douglas to Oppeano | 1,000.87 mi (1,610.74 km) |
| Douglas to Orbassano | 869.60 mi (1,399.48 km) |
| Douglas to Orbetello | 1,124.34 mi (1,809.45 km) |
