Average GPS coordinates for San Marcos Postcode location: 21.9, -100.017. (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):
>> San Luis Potosi, 79604 San Marcos, Rioverde, GPS coordinates: 21.9,-100.0167
>> San Luis Potosi, 79625 San Marcos, Rioverde, Rio Verde, GPS coordinates: 21.9,-100.0167