Groton Connecticut ZIP Codes

Groton holds 2 ZIP codes, all inside one planning region and one postal prefix.

Every ZIP code in Groton

The complete list of Groton, Connecticut ZIP codes with the planning region each falls in.
ZIP code	Planning region
06340	Southeastern Connecticut Planning Region
06349	Southeastern Connecticut Planning Region

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Groton codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Groton. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Groton ZIP code begins 063. Those first three digits identify the sectional center facility that processes mail for this part of Connecticut. Statewide that range covers 39 ZIP codes, so Groton accounts for 5% of it.

Every Connecticut ZIP prefix and the region it covers →

Area codes covering Groton

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Groton occupies.

Groton Connecticut area codes in full →

Where Groton's ZIP codes sit

Each point is one Groton ZIP code, plotted from its record coordinates.

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

Cities near Groton

The closest places to Groton with their own ZIP code list, nearest first.
City	Distance	ZIP codes
New London Connecticut ZIP codes	1.6 mi	1 ZIP code
Stonington Connecticut ZIP codes	8.7 mi	1 ZIP code
Oakdale Connecticut ZIP codes	12 mi	1 ZIP code
Norwich Connecticut ZIP codes	15 mi	1 ZIP code
Jewett City Connecticut ZIP codes	20 mi	1 ZIP code
Madison Connecticut ZIP codes	29 mi	1 ZIP code
Middletown Connecticut ZIP codes	34 mi	2 ZIP codes
Danielson Connecticut ZIP codes	35 mi	1 ZIP code

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