| Mastic Beach to Montalegre | 3,292.87 mi (5,299.37 km) |
| Mastic Beach to Montemor-o-Novo | 3,357.74 mi (5,403.77 km) |
| Mastic Beach to Montemor-o-Velho | 3,293.15 mi (5,299.82 km) |
| Mastic Beach to Montijo | 3,323.14 mi (5,348.08 km) |
| Mastic Beach to Mortagua | 3,307.90 mi (5,323.56 km) |
| Mastic Beach to Moura | 3,410.33 mi (5,488.40 km) |
| Mastic Beach to Murtosa | 3,280.58 mi (5,279.58 km) |
| Mastic Beach to Nazare | 3,289.69 mi (5,294.24 km) |
| Mastic Beach to Nelas | 3,324.25 mi (5,349.87 km) |
| Mastic Beach to Obidos | 3,291.80 mi (5,297.64 km) |
| Mastic Beach to Odemira | 3,367.75 mi (5,419.87 km) |
| Mastic Beach to Odivelas | 3,306.37 mi (5,321.08 km) |
| Mastic Beach to Oeiras | 3,302.59 mi (5,315.00 km) |
| Mastic Beach to Olhao | 3,423.55 mi (5,509.68 km) |
| Mastic Beach to Oliveira de Azemeis | 3,285.44 mi (5,287.41 km) |
