| Circleville to Mangualde | 3,843.33 mi (6,185.25 km) |
| Circleville to Marco de Canavezes | 3,807.89 mi (6,128.20 km) |
| Circleville to Marinha Grande | 3,812.95 mi (6,136.35 km) |
| Circleville to Massama | 3,826.38 mi (6,157.97 km) |
| Circleville to Matosinhos | 3,781.94 mi (6,086.45 km) |
| Circleville to Mealhada | 3,817.21 mi (6,143.20 km) |
| Circleville to Melgaco | 3,775.49 mi (6,076.06 km) |
| Circleville to Melres | 3,799.50 mi (6,114.70 km) |
| Circleville to Mira | 3,802.26 mi (6,119.14 km) |
| Circleville to Miranda do Corvo | 3,831.19 mi (6,165.70 km) |
| Circleville to Mirandela | 3,844.52 mi (6,187.15 km) |
| Circleville to Mogadouro | 3,870.79 mi (6,229.43 km) |
| Circleville to Moimenta da Beira | 3,839.15 mi (6,178.52 km) |
| Circleville to Moita | 3,843.75 mi (6,185.91 km) |
| Circleville to Moncao | 3,766.76 mi (6,062.01 km) |
