| Watertown Town to Mangualde | 3,205.93 mi (5,159.45 km) |
| Watertown Town to Marco de Canavezes | 3,171.18 mi (5,103.52 km) |
| Watertown Town to Marinha Grande | 3,173.87 mi (5,107.85 km) |
| Watertown Town to Massama | 3,186.18 mi (5,127.67 km) |
| Watertown Town to Matosinhos | 3,144.93 mi (5,061.28 km) |
| Watertown Town to Mealhada | 3,179.14 mi (5,116.34 km) |
| Watertown Town to Melgaco | 3,140.36 mi (5,053.92 km) |
| Watertown Town to Melres | 3,162.46 mi (5,089.49 km) |
| Watertown Town to Mira | 3,164.12 mi (5,092.17 km) |
| Watertown Town to Miranda do Corvo | 3,192.80 mi (5,138.31 km) |
| Watertown Town to Mirandela | 3,208.88 mi (5,164.20 km) |
| Watertown Town to Mogadouro | 3,235.17 mi (5,206.50 km) |
| Watertown Town to Moimenta da Beira | 3,202.41 mi (5,153.79 km) |
| Watertown Town to Moita | 3,203.55 mi (5,155.61 km) |
| Watertown Town to Moncao | 3,131.41 mi (5,039.53 km) |
