Average GPS coordinates for San Marco Postcode location: 40.775, 14.634. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Marco on map:

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Listing cities & postcodes (2):
>> Campania, 81057 San Marco, Caserta, GPS coordinates: 41.2667,14.3167
>> Campania, 84048 San Marco, Salerno, GPS coordinates: 40.2828,14.9522