Average GPS coordinates for Greenport Postcode location: 41.104, -72.367. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Greenport on map:

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Listing cities & postcodes (1):
>> New York, 11944 Greenport, Suffolk, GPS coordinates: 41.1039,-72.3674