Average GPS coordinates for 18 de Marzo Postcode location: 21.889, -99.615. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). 18 de Marzo on map:

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Listing cities & postcodes (2):
>> San Luis Potosi, 79020 18 de Marzo, Ciudad Valles, Ciudad Valles, GPS coordinates: 21.9778,-100.2889
>> San Luis Potosi, 79160 18 de Marzo, Ebano, Ebano, GPS coordinates: 21.8,-98.9417