ZIP Code 06340

06340 is one of Connecticut's ZIP codes, delivering to addresses in Groton, Southeastern Connecticut Planning Region.

City

Groton

Planning region

Southeastern Connecticut Planning Region

State

Connecticut

Prefix

063xx

Where this code sits

06340 is part of the 063xx range, the group of codes handled by one mail processing centre. Groton is served by 2 ZIP codes in total; the full list, with the planning region each falls in, is on the Groton page.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 06340 delivers to without sharing its boundary.

ZIP codes nearest 06340

The ZIP codes whose reference points sit closest to 06340.
ZIP code	Distance	Delivers to
ZIP code 06320	2.5 mi	New London, CT
ZIP code 06349	3.4 mi	Groton, CT
ZIP code 06355	4.2 mi	Mystic, CT
ZIP code 06388	4.3 mi	West Mystic, CT
ZIP code 06375	4.4 mi	Quaker Hill, CT
ZIP code 06385	4.6 mi	Waterford, CT
ZIP code 06335	4.9 mi	Gales Ferry, CT
ZIP code 06372	6.0 mi	Old Mystic, CT

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 06340, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 06340. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.