| Portsmouth to Mozzate | 581.02 mi (935.06 km) |
| Portsmouth to Muggia | 770.89 mi (1,240.63 km) |
| Portsmouth to Muggio | 595.12 mi (957.76 km) |
| Portsmouth to Mugnano di Napoli | 1,001.03 mi (1,611.01 km) |
| Portsmouth to Musile di Piave | 722.00 mi (1,161.94 km) |
| Portsmouth to Mussomeli | 1,168.28 mi (1,880.17 km) |
| Portsmouth to Naples | 1,006.35 mi (1,619.57 km) |
| Portsmouth to Nardo | 1,175.80 mi (1,892.27 km) |
| Portsmouth to Narni | 860.20 mi (1,384.36 km) |
| Portsmouth to Nembro | 608.21 mi (978.82 km) |
| Portsmouth to Nepi | 868.06 mi (1,397.02 km) |
| Portsmouth to Nerviano | 588.32 mi (946.81 km) |
| Portsmouth to Nettuno | 919.15 mi (1,479.23 km) |
| Portsmouth to Nichelino | 569.21 mi (916.06 km) |
| Portsmouth to Nicosia | 1,178.61 mi (1,896.78 km) |
