Average GPS coordinates for Niantic Postcode location: 41.325, -72.211. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Niantic on map:

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Listing cities & postcodes (1):
>> Connecticut, 06357 Niantic, New London, GPS coordinates: 41.3253,-72.2108