ZIP Code 06357

06357 is one of Connecticut's ZIP codes, delivering to addresses in Niantic, Southeastern Connecticut Planning Region.

City: Niantic
Planning region: Southeastern Connecticut Planning Region
State: Connecticut
Prefix: 063xx

Where this code sits

06357 is part of the 063xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Niantic.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 06357 delivers to without sharing its boundary.

ZIP codes nearest 06357

The ZIP codes whose reference points sit closest to 06357.
ZIP code	Distance	Delivers to
ZIP code 06333	3.1 mi	East Lyme, CT
ZIP code 06376	3.4 mi	South Lyme, CT
ZIP code 06385	3.7 mi	Waterford, CT
ZIP code 06371	5.1 mi	Old Lyme, CT
ZIP code 06320	5.7 mi	New London, CT
ZIP code 06375	7.2 mi	Quaker Hill, CT
ZIP code 06349	8.1 mi	Groton, CT
ZIP code 06340	8.2 mi	Groton, 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 06357, plotted from its record coordinates.

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

Scope ZIP code 06357. 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.