| Pittsburgh to Mangualde | 3,677.59 mi (5,918.50 km) |
| Pittsburgh to Marco de Canavezes | 3,642.30 mi (5,861.71 km) |
| Pittsburgh to Marinha Grande | 3,646.81 mi (5,868.98 km) |
| Pittsburgh to Massama | 3,659.98 mi (5,890.17 km) |
| Pittsburgh to Matosinhos | 3,616.28 mi (5,819.84 km) |
| Pittsburgh to Mealhada | 3,651.30 mi (5,876.20 km) |
| Pittsburgh to Melgaco | 3,610.27 mi (5,810.16 km) |
| Pittsburgh to Melres | 3,633.83 mi (5,848.09 km) |
| Pittsburgh to Mira | 3,636.33 mi (5,852.12 km) |
| Pittsburgh to Miranda do Corvo | 3,665.21 mi (5,898.58 km) |
| Pittsburgh to Mirandela | 3,679.18 mi (5,921.07 km) |
| Pittsburgh to Mogadouro | 3,705.46 mi (5,963.36 km) |
| Pittsburgh to Moimenta da Beira | 3,673.56 mi (5,912.02 km) |
| Pittsburgh to Moita | 3,677.34 mi (5,918.11 km) |
| Pittsburgh to Moncao | 3,601.49 mi (5,796.03 km) |
