Average GPS coordinates for Olivais Postcode location: 41.244, -8.449. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Olivais on map:

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Listing cities & postcodes (3):
>> Porto, 4600-612 Olivais, Corvo, Espadanedo, GPS coordinates: 41.2333,-8.5056
>> Porto, 4600-620 Olivais, Corvo, Grijó, GPS coordinates: 41.3167,-8.3083
>> Porto, 4605-140 Olivais, Corvo, Olmos, GPS coordinates: 41.1833,-8.5333