Average GPS coordinates for San Martin Postcode location: 28.983, -110.7. (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 (2):
>> Sonora, 84160 San Martin, Magdalena, GPS coordinates: 29.75,-110.9
>> Sonora, 85516 San Martin, San Ignacio Rio Muerto, GPS coordinates: 28.2167,-110.5