| Portsmouth to Montevarchi | 776.79 mi (1,250.12 km) |
| Portsmouth to Monticello Conte Otto | 684.06 mi (1,100.89 km) |
| Portsmouth to Montichiari | 646.22 mi (1,040.00 km) |
| Portsmouth to Montignoso | 703.54 mi (1,132.24 km) |
| Portsmouth to Montopoli in Val d'Arno | 741.14 mi (1,192.76 km) |
| Portsmouth to Monza | 597.34 mi (961.32 km) |
| Portsmouth to Morbegno | 584.30 mi (940.33 km) |
| Portsmouth to Mori | 650.50 mi (1,046.89 km) |
| Portsmouth to Morlupo | 878.64 mi (1,414.03 km) |
| Portsmouth to Morrovalle | 860.30 mi (1,384.52 km) |
| Portsmouth to Mortara | 594.08 mi (956.08 km) |
| Portsmouth to Mosciano Sant'Angelo | 898.01 mi (1,445.21 km) |
| Portsmouth to Motta di Livenza | 717.43 mi (1,154.60 km) |
| Portsmouth to Motta Sant'Anastasia | 1,210.63 mi (1,948.31 km) |
| Portsmouth to Mottola | 1,116.45 mi (1,796.75 km) |
