| Portsmouth to Marsala | 1,116.39 mi (1,796.66 km) |
| Portsmouth to Marsciano | 833.86 mi (1,341.97 km) |
| Portsmouth to Martano | 1,184.80 mi (1,906.75 km) |
| Portsmouth to Martellago | 708.71 mi (1,140.55 km) |
| Portsmouth to Martina Franca | 1,124.35 mi (1,809.47 km) |
| Portsmouth to Martinengo | 616.12 mi (991.56 km) |
| Portsmouth to Martinsicuro | 892.94 mi (1,437.04 km) |
| Portsmouth to Mascali | 1,204.11 mi (1,937.83 km) |
| Portsmouth to Mascalucia | 1,209.54 mi (1,946.56 km) |
| Portsmouth to Masera di Padova | 706.77 mi (1,137.43 km) |
| Portsmouth to Maserada sul Piave | 706.94 mi (1,137.72 km) |
| Portsmouth to Massa | 701.56 mi (1,129.06 km) |
| Portsmouth to Massa Lombarda | 742.53 mi (1,194.99 km) |
| Portsmouth to Massafra | 1,121.98 mi (1,805.66 km) |
| Portsmouth to Massalubrense | 1,021.04 mi (1,643.20 km) |
