Average GPS coordinates for El Castillo Postcode location: 27.517, -110.183. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). El Castillo on map:

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Listing cities & postcodes (2):
>> Sonora, 85288 El Castillo, Etchojoa, GPS coordinates: 27.5167,-110.1833
>> Sonora, 85513 El Castillo, Guaymas, GPS coordinates: 27.5167,-110.1833