Average GPS coordinates for San Marcos Postcode location: 19.838, -88.783. (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 (1):
>> Quintana Roo, 77875 San Marcos, Jose Maria Morelos, GPS coordinates: 19.8375,-88.7833