Average GPS coordinates for San Luis Postcode location: 18.796, -96.383. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Luis on map:

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Listing cities & postcodes (1):
>> Veracruz Llave, 95657 San Luis, Isla, GPS coordinates: 18.7958,-96.3833