Average GPS coordinates for San Marcos Postcode location: 18.925, -103.689. (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 (3):
>> Chihuahua, 31300 San Marcos, Chihuahua, Chihuahua, GPS coordinates: 18.925,-103.6889
>> Chihuahua, 32409 San Marcos, Juarez, Ciudad Juarez, GPS coordinates: 18.925,-103.6889
>> Chihuahua, 33018 San Marcos, Delicias, Ciudad Delicias, GPS coordinates: 18.925,-103.6889