| Portsmouth to Niscemi | 1,212.23 mi (1,950.90 km) |
| Portsmouth to Nizza Monferrato | 603.90 mi (971.89 km) |
| Portsmouth to Noale | 705.17 mi (1,134.86 km) |
| Portsmouth to Nocera Inferiore | 1,024.02 mi (1,648.00 km) |
| Portsmouth to Nocera Superiore | 1,025.81 mi (1,650.88 km) |
| Portsmouth to Noceto | 665.65 mi (1,071.26 km) |
| Portsmouth to Noci | 1,112.05 mi (1,789.66 km) |
| Portsmouth to Noicattaro | 1,095.18 mi (1,762.52 km) |
| Portsmouth to Nola | 1,011.12 mi (1,627.24 km) |
| Portsmouth to Nonantola | 703.48 mi (1,132.14 km) |
| Portsmouth to Noto | 1,249.21 mi (2,010.40 km) |
| Portsmouth to Nova Milanese | 594.66 mi (957.02 km) |
| Portsmouth to Novara | 579.88 mi (933.22 km) |
| Portsmouth to Novate Milanese | 594.51 mi (956.78 km) |
| Portsmouth to Novellara | 684.20 mi (1,101.12 km) |
