Average GPS coordinates for São Martinho Postcode location: 41.94, -8.493. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). São Martinho on map:

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Listing cities & postcodes (4):
>> Viana do Castelo, 4910-203 São Martinho, Santa Cruz das Flores, Corujas, GPS coordinates: 41.9,-8.5778
>> Viana do Castelo, 4910-301 São Martinho, Santa Cruz das Flores, Espadanedo, GPS coordinates: 41.95,-8.575
>> Viana do Castelo, 4970-046 São Martinho, Corvo, Cicouro, GPS coordinates: 41.9611,-8.3875
>> Viana do Castelo, 4970-064 São Martinho, Corvo, Constantim, GPS coordinates: 41.95,-8.4333