| Portsmouth to Manerbio | 638.75 mi (1,027.97 km) |
| Portsmouth to Manfredonia | 1,026.58 mi (1,652.12 km) |
| Portsmouth to Maniago | 707.26 mi (1,138.22 km) |
| Portsmouth to Mantova | 672.62 mi (1,082.48 km) |
| Portsmouth to Maranello | 703.66 mi (1,132.42 km) |
| Portsmouth to Marano di Napoli | 1,000.59 mi (1,610.30 km) |
| Portsmouth to Marano Vicentino | 674.13 mi (1,084.91 km) |
| Portsmouth to Marcianise | 997.82 mi (1,605.84 km) |
| Portsmouth to Marcon | 713.99 mi (1,149.06 km) |
| Portsmouth to Mareno di Piave | 704.82 mi (1,134.30 km) |
| Portsmouth to Margherita di Savoia | 1,048.07 mi (1,686.70 km) |
| Portsmouth to Mariano Comense | 588.79 mi (947.56 km) |
| Portsmouth to Marigliano | 1,008.20 mi (1,622.54 km) |
| Portsmouth to Marino | 903.55 mi (1,454.12 km) |
| Portsmouth to Marostica | 680.98 mi (1,095.93 km) |
