| Opmeer to Alfena | 1,011.85 mi (1,628.42 km) |
| Opmeer to Alijo | 979.89 mi (1,576.98 km) |
| Opmeer to Aljustrel | 1,199.78 mi (1,930.85 km) |
| Opmeer to Almada | 1,179.47 mi (1,898.17 km) |
| Opmeer to Almargem | 1,172.60 mi (1,887.11 km) |
| Opmeer to Almeirim | 1,133.79 mi (1,824.66 km) |
| Opmeer to Amadora | 1,178.35 mi (1,896.37 km) |
| Opmeer to Amarante | 997.03 mi (1,604.56 km) |
| Opmeer to Amares | 984.63 mi (1,584.60 km) |
| Opmeer to Amora | 1,181.62 mi (1,901.63 km) |
| Opmeer to Anadia | 1,055.84 mi (1,699.21 km) |
| Opmeer to Angra do Heroismo | 1,808.29 mi (2,910.16 km) |
| Opmeer to Ansiao | 1,086.22 mi (1,748.11 km) |
| Opmeer to Anta | 1,027.99 mi (1,654.39 km) |
| Opmeer to Arcos de Valdevez | 974.05 mi (1,567.59 km) |
