Average GPS coordinates for Santiago Postcode location: -4.781, -79.893. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Santiago on map:

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Listing cities & postcodes (2):
>> Piura, 20220 Santiago, Ayabaca, GPS coordinates: -4.51143, -79.99337
>> Piura, 20350 Santiago, Morropón, GPS coordinates: -5.04962, -79.79242