| Pittsburgh to Montalegre | 3,640.83 mi (5,859.35 km) |
| Pittsburgh to Montemor-o-Novo | 3,714.46 mi (5,977.85 km) |
| Pittsburgh to Montemor-o-Velho | 3,646.52 mi (5,868.50 km) |
| Pittsburgh to Montijo | 3,680.37 mi (5,922.98 km) |
| Pittsburgh to Mortagua | 3,660.16 mi (5,890.46 km) |
| Pittsburgh to Moura | 3,767.58 mi (6,063.34 km) |
| Pittsburgh to Murtosa | 3,632.39 mi (5,845.76 km) |
| Pittsburgh to Nazare | 3,644.84 mi (5,865.80 km) |
| Pittsburgh to Nelas | 3,675.94 mi (5,915.85 km) |
| Pittsburgh to Obidos | 3,647.63 mi (5,870.29 km) |
| Pittsburgh to Odemira | 3,727.22 mi (5,998.39 km) |
| Pittsburgh to Odivelas | 3,663.58 mi (5,895.96 km) |
| Pittsburgh to Oeiras | 3,660.17 mi (5,890.47 km) |
| Pittsburgh to Olhao | 3,783.55 mi (6,089.04 km) |
| Pittsburgh to Oliveira de Azemeis | 3,636.82 mi (5,852.89 km) |
