Average GPS coordinates for San Luis Postcode location: -4.848, -74.989. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Luis on map:

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Listing cities & postcodes (3):
>> Loreto, 16550 San Luis, Alto Amazonas, GPS coordinates: -5.30125, -75.79741
>> Loreto, 16500 San Luis, Alto Amazonas, GPS coordinates: -5.79799, -76.17699
>> Loreto, 16200 San Luis, Maynas, GPS coordinates: -3.44522, -72.99173