| Duluth to Noventa Vicentina | 4,572.47 mi (7,358.68 km) |
| Duluth to Novi di Modena | 4,568.45 mi (7,352.21 km) |
| Duluth to Novi Ligure | 4,498.49 mi (7,239.62 km) |
| Duluth to Nuoro | 4,728.22 mi (7,609.33 km) |
| Duluth to Occhiobello | 4,591.34 mi (7,389.05 km) |
| Duluth to Oderzo | 4,582.51 mi (7,374.83 km) |
| Duluth to Oggiono | 4,471.39 mi (7,196.01 km) |
| Duluth to Olbia | 4,705.86 mi (7,573.35 km) |
| Duluth to Oleggio | 4,454.12 mi (7,168.22 km) |
| Duluth to Olgiate Comasco | 4,457.66 mi (7,173.91 km) |
| Duluth to Olgiate Olona | 4,461.59 mi (7,180.23 km) |
| Duluth to Omegna | 4,433.19 mi (7,134.53 km) |
| Duluth to Opera | 4,485.14 mi (7,218.14 km) |
| Duluth to Oppeano | 4,559.29 mi (7,337.46 km) |
| Duluth to Orbassano | 4,441.50 mi (7,147.90 km) |
