Average GPS coordinates for San Juan Postcode location: -5.159, -79.705. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Juan on map:

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Listing cities & postcodes (2):
>> Piura, 20550 San Juan, Ayabaca, GPS coordinates: -4.79051, -79.84294
>> Piura, 20470 San Juan, Huancabamba, GPS coordinates: -5.52743, -79.56777