| Johnston to Mangualde | 4,268.87 mi (6,870.08 km) |
| Johnston to Marco de Canavezes | 4,230.41 mi (6,808.18 km) |
| Johnston to Marinha Grande | 4,248.00 mi (6,836.50 km) |
| Johnston to Massama | 4,269.28 mi (6,870.74 km) |
| Johnston to Matosinhos | 4,206.08 mi (6,769.04 km) |
| Johnston to Mealhada | 4,246.37 mi (6,833.86 km) |
| Johnston to Melgaco | 4,191.47 mi (6,745.53 km) |
| Johnston to Melres | 4,223.60 mi (6,797.23 km) |
| Johnston to Mira | 4,231.90 mi (6,810.58 km) |
| Johnston to Miranda do Corvo | 4,262.00 mi (6,859.03 km) |
| Johnston to Mirandela | 4,261.95 mi (6,858.95 km) |
| Johnston to Mogadouro | 4,287.93 mi (6,900.76 km) |
| Johnston to Moimenta da Beira | 4,261.55 mi (6,858.31 km) |
| Johnston to Moita | 4,286.50 mi (6,898.45 km) |
| Johnston to Moncao | 4,183.69 mi (6,733.00 km) |
