| Prospect Heights to Montalegre | 3,951.60 mi (6,359.49 km) |
| Prospect Heights to Montemor-o-Novo | 4,043.08 mi (6,506.70 km) |
| Prospect Heights to Montemor-o-Velho | 3,968.25 mi (6,386.28 km) |
| Prospect Heights to Montijo | 4,010.29 mi (6,453.94 km) |
| Prospect Heights to Mortagua | 3,979.50 mi (6,404.39 km) |
| Prospect Heights to Moura | 4,097.12 mi (6,593.67 km) |
| Prospect Heights to Murtosa | 3,950.96 mi (6,358.46 km) |
| Prospect Heights to Nazare | 3,970.38 mi (6,389.71 km) |
| Prospect Heights to Nelas | 3,994.01 mi (6,427.74 km) |
| Prospect Heights to Obidos | 3,974.63 mi (6,396.55 km) |
| Prospect Heights to Odemira | 4,062.05 mi (6,537.24 km) |
| Prospect Heights to Odivelas | 3,993.56 mi (6,427.01 km) |
| Prospect Heights to Oeiras | 3,990.98 mi (6,422.86 km) |
| Prospect Heights to Olhao | 4,119.35 mi (6,629.46 km) |
| Prospect Heights to Oliveira de Azemeis | 3,954.48 mi (6,364.11 km) |
