Average GPS coordinates for Seixo Postcode location: 40.742, -7.842. (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 (2):
>> Viseu, 3465-060 Seixo, Tondela, Cicouro, GPS coordinates: 40.55,-8.1333
>> Viseu, 3640-180 Seixo, Sernancelhe, Grijó, GPS coordinates: 40.9333,-7.55