Average GPS coordinates for San Marcos Postcode location: 23.533, -106.233. (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):
>> Sinaloa, 82313 San Marcos, Mazatlan, GPS coordinates: 23.5333,-106.2333