Average GPS coordinates for Alca Postcode location: -15.142, -72.648. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Alca on map:

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Listing cities & postcodes (1):
>> Arequipa, 04830 Alca, La Unión, GPS coordinates: -15.14157, -72.64801