Average GPS coordinates for Oeiras Postcode location: -6.907, -42.175. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Oeiras on map:

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Listing cities & postcodes (1):
>> Piaui, 64500-000 Oeiras, GPS coordinates: -6.9069,-42.1753