Average GPS coordinates for San Marcos Postcode location: 20.421, -99.128. (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):
>> Hidalgo, 42831 San Marcos, Tula de Allende, GPS coordinates: 20.0333,-99.3333
>> Hidalgo, 43184 San Marcos, Tlahuiltepa, GPS coordinates: 20.8083,-98.9236