Average GPS coordinates for San Marco Postcode location: 45.537, 12.143. (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):
>> Veneto, 30124 San Marco, Venezia, GPS coordinates: 45.4386,12.3267
>> Veneto, 31023 San Marco, Treviso, GPS coordinates: 45.6352,11.9586