Average GPS coordinates for Seixal Postcode location: 40.71, -8.404. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seixal on map:

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Listing cities & postcodes (3):
>> Aveiro, 3700-735 Seixal, Santana, Ferreira, GPS coordinates: 40.6167,-8.3667
>> Aveiro, 3700-745 Seixal, Santana, Ferreira, GPS coordinates: 40.8944,-8.2778
>> Aveiro, 3770-037 Seixal, Santa Comba Dão, Cicouro, GPS coordinates: 40.62,-8.5667