| Portsmouth to Massarosa | 716.75 mi (1,153.50 km) |
| Portsmouth to Matelica | 841.88 mi (1,354.87 km) |
| Portsmouth to Matera | 1,098.83 mi (1,768.39 km) |
| Portsmouth to Matino | 1,186.70 mi (1,909.81 km) |
| Portsmouth to Mazzarino | 1,198.00 mi (1,927.99 km) |
| Portsmouth to Meda | 589.67 mi (948.99 km) |
| Portsmouth to Medesano | 666.97 mi (1,073.38 km) |
| Portsmouth to Medicina | 734.19 mi (1,181.56 km) |
| Portsmouth to Meldola | 765.63 mi (1,232.16 km) |
| Portsmouth to Melegnano | 609.43 mi (980.78 km) |
| Portsmouth to Melendugno | 1,182.82 mi (1,903.56 km) |
| Portsmouth to Melfi | 1,047.66 mi (1,686.05 km) |
| Portsmouth to Melilli | 1,233.24 mi (1,984.72 km) |
| Portsmouth to Melito di Napoli | 1,001.47 mi (1,611.72 km) |
| Portsmouth to Melito di Porto Salvo | 1,213.99 mi (1,953.72 km) |
