| Herndon to Noventa Vicentina | 4,338.55 mi (6,982.22 km) |
| Herndon to Novi di Modena | 4,324.63 mi (6,959.81 km) |
| Herndon to Novi Ligure | 4,237.83 mi (6,820.13 km) |
| Herndon to Nuoro | 4,411.13 mi (7,099.02 km) |
| Herndon to Occhiobello | 4,352.77 mi (7,005.10 km) |
| Herndon to Oderzo | 4,362.31 mi (7,020.45 km) |
| Herndon to Oggiono | 4,229.16 mi (6,806.17 km) |
| Herndon to Olbia | 4,397.93 mi (7,077.79 km) |
| Herndon to Oleggio | 4,204.33 mi (6,766.22 km) |
| Herndon to Olgiate Comasco | 4,212.79 mi (6,779.82 km) |
| Herndon to Olgiate Olona | 4,214.00 mi (6,781.77 km) |
| Herndon to Omegna | 4,185.83 mi (6,736.44 km) |
| Herndon to Opera | 4,236.31 mi (6,817.68 km) |
| Herndon to Oppeano | 4,323.11 mi (6,957.37 km) |
| Herndon to Orbassano | 4,175.69 mi (6,720.12 km) |
