| Portsmouth to Melzo | 606.35 mi (975.83 km) |
| Portsmouth to Mendicino | 1,155.73 mi (1,859.97 km) |
| Portsmouth to Menfi | 1,143.13 mi (1,839.69 km) |
| Portsmouth to Mentana | 890.13 mi (1,432.53 km) |
| Portsmouth to Merano | 625.90 mi (1,007.30 km) |
| Portsmouth to Merate | 598.00 mi (962.38 km) |
| Portsmouth to Mercato San Severino | 1,027.00 mi (1,652.79 km) |
| Portsmouth to Mercogliano | 1,019.03 mi (1,639.97 km) |
| Portsmouth to Mesagne | 1,148.27 mi (1,847.97 km) |
| Portsmouth to Messina | 1,191.22 mi (1,917.08 km) |
| Portsmouth to Mestre | 714.14 mi (1,149.29 km) |
| Portsmouth to Mestrino | 697.36 mi (1,122.29 km) |
| Portsmouth to Milan | 599.61 mi (964.98 km) |
| Portsmouth to Milazzo | 1,179.47 mi (1,898.17 km) |
| Portsmouth to Minerbio | 722.10 mi (1,162.12 km) |
