| Merriam to Mangualde | 4,409.00 mi (7,095.60 km) |
| Merriam to Marco de Canavezes | 4,371.43 mi (7,035.13 km) |
| Merriam to Marinha Grande | 4,385.04 mi (7,057.03 km) |
| Merriam to Massama | 4,403.69 mi (7,087.05 km) |
| Merriam to Matosinhos | 4,346.56 mi (6,995.11 km) |
| Merriam to Mealhada | 4,385.32 mi (7,057.48 km) |
| Merriam to Melgaco | 4,334.43 mi (6,975.58 km) |
| Merriam to Melres | 4,364.12 mi (7,023.37 km) |
| Merriam to Mira | 4,370.67 mi (7,033.91 km) |
| Merriam to Miranda do Corvo | 4,400.44 mi (7,081.82 km) |
| Merriam to Mirandela | 4,404.58 mi (7,088.48 km) |
| Merriam to Mogadouro | 4,430.68 mi (7,130.50 km) |
| Merriam to Moimenta da Beira | 4,402.66 mi (7,085.39 km) |
| Merriam to Moita | 4,420.98 mi (7,114.88 km) |
| Merriam to Moncao | 4,326.35 mi (6,962.58 km) |
