| Montesilvano to Montemor-o-Novo | 1,199.84 mi (1,930.96 km) |
| Montesilvano to Montemor-o-Velho | 1,191.81 mi (1,918.04 km) |
| Montesilvano to Montijo | 1,233.73 mi (1,985.49 km) |
| Montesilvano to Mortagua | 1,164.17 mi (1,873.55 km) |
| Montesilvano to Moura | 1,173.76 mi (1,888.99 km) |
| Montesilvano to Murtosa | 1,179.53 mi (1,898.27 km) |
| Montesilvano to Nazare | 1,222.23 mi (1,967.00 km) |
| Montesilvano to Nelas | 1,143.22 mi (1,839.84 km) |
| Montesilvano to Obidos | 1,231.86 mi (1,982.49 km) |
| Montesilvano to Odemira | 1,247.92 mi (2,008.33 km) |
| Montesilvano to Odivelas | 1,245.46 mi (2,004.37 km) |
| Montesilvano to Oeiras | 1,254.89 mi (2,019.55 km) |
| Montesilvano to Olhao | 1,223.73 mi (1,969.40 km) |
| Montesilvano to Oliveira de Azemeis | 1,169.77 mi (1,882.56 km) |
| Montesilvano to Oliveira de Frades | 1,156.89 mi (1,861.83 km) |
