Average GPS coordinates for Groton Postcode location: 42.502, -71.492. (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 (3):
>> Massachusetts, 01450 Groton, Middlesex, GPS coordinates: 42.6124,-71.5584
>> Massachusetts, 01470 Groton, Middlesex, GPS coordinates: 42.4464,-71.4594
>> Massachusetts, 01471 Groton, Middlesex, GPS coordinates: 42.4464,-71.4594