| Shannon to Montemor-o-Novo | 972.21 mi (1,564.61 km) |
| Shannon to Montemor-o-Velho | 866.96 mi (1,395.23 km) |
| Shannon to Montijo | 969.41 mi (1,560.11 km) |
| Shannon to Mortagua | 849.02 mi (1,366.37 km) |
| Shannon to Moura | 1,009.70 mi (1,624.96 km) |
| Shannon to Murtosa | 827.84 mi (1,332.28 km) |
| Shannon to Nazare | 906.12 mi (1,458.26 km) |
| Shannon to Nelas | 844.09 mi (1,358.44 km) |
| Shannon to Obidos | 922.88 mi (1,485.24 km) |
| Shannon to Odemira | 1,045.47 mi (1,682.52 km) |
| Shannon to Odivelas | 962.13 mi (1,548.40 km) |
| Shannon to Oeiras | 969.64 mi (1,560.49 km) |
| Shannon to Olhao | 1,085.05 mi (1,746.22 km) |
| Shannon to Oliveira de Azemeis | 820.60 mi (1,320.63 km) |
| Shannon to Oliveira de Frades | 829.54 mi (1,335.01 km) |
