Average GPS coordinates for San Marcos Postcode location: 27.133, -101.917. (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):
>> Chiapas, 29130 San Marcos, Berriozabal, GPS coordinates: 26.8,-102.15
>> Chiapas, 30400 San Marcos, Cintalapa, Cintalapa de Figueroa, GPS coordinates: 27.4667,-101.6833