Average GPS coordinates for Castaic Postcode location: 34.135, -118.462. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Castaic on map:

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Listing cities & postcodes (2):
>> California, 91310 Castaic, Los Angeles, GPS coordinates: 33.7866,-118.2987
>> California, 91384 Castaic, Los Angeles, GPS coordinates: 34.4827,-118.6254