Average GPS coordinates for Groton Postcode location: 41.378, -72.074. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Groton on map:

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Listing cities & postcodes (2):
>> Connecticut, 06340 Groton, New London, GPS coordinates: 41.3572,-72.0579
>> Connecticut, 06349 Groton, New London, GPS coordinates: 41.3997,-72.0904