ZIP Code 06437

06437 is one of Connecticut's ZIP codes, delivering to addresses in Guilford, South Central Connecticut Planning Region.

City: Guilford
Planning region: South Central Connecticut Planning Region
State: Connecticut
Prefix: 064xx

Where this code sits

06437 is part of the 064xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Guilford.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 06437 delivers to without sharing its boundary.

ZIP codes nearest 06437

The ZIP codes whose reference points sit closest to 06437.
ZIP code	Distance	Delivers to
ZIP code 06443	4.3 mi	Madison, CT
ZIP code 06471	4.5 mi	North Branford, CT
ZIP code 06405	6.4 mi	Branford, CT
ZIP code 06472	7.1 mi	Northford, CT
ZIP code 06419	7.5 mi	Killingworth, CT
ZIP code 06513	8.8 mi	New Haven, CT
ZIP code 06413	8.9 mi	Clinton, CT
ZIP code 06473	9.6 mi	North Haven, 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 06437, plotted from its record coordinates.

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

Scope ZIP code 06437. 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.