Average GPS coordinates for Gilman Postcode location: 41.58, -72.196. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Gilman on map:

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Listing cities & postcodes (1):
>> Connecticut, 06336 Gilman, New London, GPS coordinates: 41.5795,-72.1963