Average GPS coordinates for San Martin Postcode location: -5.276, -79.635. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Martin on map:

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Listing cities & postcodes (3):
>> Piura, 20560 San Martin, Ayabaca, GPS coordinates: -4.92829, -79.72382
>> Piura, 20430 San Martin, Huancabamba, GPS coordinates: -5.37255, -79.61379
>> Piura, 20470 San Martin, Huancabamba, GPS coordinates: -5.52743, -79.56777