Average GPS coordinates for Sierra Vista Postcode location: 30.183, -111.208. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Sierra Vista on map:

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Listing cities & postcodes (3):
>> Sonora, 83147 Sierra Vista, Hermosillo, Hermosillo, GPS coordinates: 30.3333,-110.7167
>> Sonora, 84064 Sierra Vista, Nogales, Nogales, GPS coordinates: 29.4444,-111.0667
>> Sonora, 85023 Sierra Vista, Cajeme, Ciudad Obregon, GPS coordinates: 30.7717,-111.8397