Average GPS coordinates for El Alto Postcode location: 28.667, -109.333. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). El Alto on map:

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Listing cities & postcodes (2):
>> Sonora, 83690 El Alto, Caborca, Caborca (heroica Caborca), GPS coordinates: 30.05,-109.7833
>> Sonora, 85243 El Alto, Huatabampo, GPS coordinates: 27.2833,-108.8833