| Irmo to Montalegre | 3,912.40 mi (6,296.40 km) |
| Irmo to Montemor-o-Novo | 3,962.67 mi (6,377.31 km) |
| Irmo to Montemor-o-Velho | 3,904.50 mi (6,283.69 km) |
| Irmo to Montijo | 3,927.20 mi (6,320.22 km) |
| Irmo to Mortagua | 3,921.03 mi (6,310.28 km) |
| Irmo to Moura | 4,013.97 mi (6,459.87 km) |
| Irmo to Murtosa | 3,894.52 mi (6,267.63 km) |
| Irmo to Nazare | 3,897.90 mi (6,273.06 km) |
| Irmo to Nelas | 3,938.23 mi (6,337.97 km) |
| Irmo to Obidos | 3,898.73 mi (6,274.41 km) |
| Irmo to Odemira | 3,966.76 mi (6,383.89 km) |
| Irmo to Odivelas | 3,910.52 mi (6,293.38 km) |
| Irmo to Oeiras | 3,906.01 mi (6,286.11 km) |
| Irmo to Olhao | 4,021.10 mi (6,471.33 km) |
| Irmo to Oliveira de Azemeis | 3,900.05 mi (6,276.52 km) |
