Average GPS coordinates for Castelo Postcode location: 40.797, -8.442. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Castelo on map:

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Listing cities & postcodes (3):
>> Aveiro, 3700-602 Castelo, Resende, Cicouro, GPS coordinates: 40.9,-8.2667
>> Aveiro, 4520-306 Castelo, Santana, Castelãos, GPS coordinates: 40.5333,-8.65
>> Aveiro, 4540-370 Castelo, Povoação, Corujas, GPS coordinates: 40.9583,-8.4083