| North Potomac to Noventa Vicentina | 4,326.90 mi (6,963.47 km) |
| North Potomac to Novi di Modena | 4,313.00 mi (6,941.10 km) |
| North Potomac to Novi Ligure | 4,226.24 mi (6,801.48 km) |
| North Potomac to Nuoro | 4,399.73 mi (7,080.68 km) |
| North Potomac to Occhiobello | 4,341.13 mi (6,986.37 km) |
| North Potomac to Oderzo | 4,350.63 mi (7,001.66 km) |
| North Potomac to Oggiono | 4,217.52 mi (6,787.44 km) |
| North Potomac to Olbia | 4,386.50 mi (7,059.39 km) |
| North Potomac to Oleggio | 4,192.71 mi (6,747.51 km) |
| North Potomac to Olgiate Comasco | 4,201.15 mi (6,761.10 km) |
| North Potomac to Olgiate Olona | 4,202.37 mi (6,763.06 km) |
| North Potomac to Omegna | 4,174.20 mi (6,717.73 km) |
| North Potomac to Opera | 4,224.69 mi (6,798.98 km) |
| North Potomac to Oppeano | 4,311.46 mi (6,938.63 km) |
| North Potomac to Orbassano | 4,164.10 mi (6,701.48 km) |
