Average GPS coordinates for Alpine Postcode location: 32.923, -116.8. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Alpine on map:

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Listing cities & postcodes (2):
>> California, 91901 Alpine, San Diego, GPS coordinates: 32.8282,-116.7543
>> California, 91903 Alpine, San Diego, GPS coordinates: 33.0169,-116.846