ZIP Code 06373

06373 is one of Connecticut's ZIP codes, delivering to addresses in Oneco, Northeastern Connecticut Planning Region.

City: Oneco
Planning region: Northeastern Connecticut Planning Region
State: Connecticut
Prefix: 063xx

Where this code sits

06373 is part of the 063xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Oneco.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 06373 delivers to without sharing its boundary.

ZIP codes nearest 06373

The ZIP codes whose reference points sit closest to 06373.
ZIP code	Distance	Delivers to
ZIP code 06377	1.6 mi	Sterling, CT
ZIP code 02827	3.9 mi	Greene, RI
ZIP code 06354	4.4 mi	Moosup, CT
ZIP code 06332	5.5 mi	Central Village, CT
ZIP code 06374	6.0 mi	Plainfield, CT
ZIP code 06387	6.4 mi	Wauregan, CT
ZIP code 02825	7.6 mi	Foster, RI
ZIP code 06384	8.0 mi	Voluntown, 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 06373, plotted from its record coordinates.

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

Scope ZIP code 06373. 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.