Average GPS coordinates for La Union Postcode location: 27.947, -109.81. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). La Union on map:

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Listing cities & postcodes (2):
>> Sonora, 85240 La Union, Huatabampo, GPS coordinates: 26.8167,-109.6
>> Sonora, 85994 La Union, Huatabampo, Huatabampo, GPS coordinates: 29.0767,-110.02