Average GPS coordinates for Seixo Postcode location: 40.683, -8.406. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seixo on map:

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Listing cities & postcodes (3):
>> Aveiro, 3720-122 Seixo, Resende, Carrapatas, GPS coordinates: 40.8458,-8.4583
>> Aveiro, 3740-410 Seixo, Sátão, Castelãos, GPS coordinates: 40.5583,-8.375
>> Aveiro, 3750-063 Seixo, Corvo, Constantim, GPS coordinates: 40.6444,-8.3861