Average GPS coordinates for San Martin Postcode location: 21.156, -101.047. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Martin on map:

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Listing cities & postcodes (1):
>> Guanajuato, 36557 San Martin, Irapuato, Irapuato, GPS coordinates: 21.1556,-101.0467