Average GPS coordinates for Seixo Postcode location: 41.213, -8.499. (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 (6):
>> Porto, 4560-800 Seixo, Penalva do Castelo, Vale Benfeito, GPS coordinates: 41.2833,-8.375
>> Porto, 4575-200 Seixo, Penalva do Castelo, Poiares, GPS coordinates: 41.125,-8.3083
>> Porto, 4580-630 Seixo, São Vicente, Olmos, GPS coordinates: 41.2833,-8.6833
>> Porto, 4605-024 Seixo, Corvo, Bagueixe, GPS coordinates: 41.1083,-8.4917
>> Porto, 4610-540 Seixo, São Roque do Pico, Espadanedo, GPS coordinates: 41.2458,-8.5042
>> Porto, 4640-300 Seixo, Santa Cruz das Flores, Carrapatas, GPS coordinates: 41.2333,-8.6333