Average GPS coordinates for San Marcos Postcode location: -12.897, -75.954. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Marcos on map:

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Listing cities & postcodes (2):
>> Lima, 15730 San Marcos, Cañete, GPS coordinates: -12.89554, -76.07778
>> Lima, 15748 San Marcos, Yauyos, GPS coordinates: -12.89889, -75.83111