ZIP Code 01366

01366 is one of Massachusetts's ZIP codes, delivering to addresses in Petersham, Worcester County.

City: Petersham
County: Worcester County
State: Massachusetts
Prefix: 013xx

Where this code sits

01366 is part of the 013xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Petersham.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 01366 delivers to without sharing its boundary.

ZIP codes nearest 01366

The ZIP codes whose reference points sit closest to 01366.
ZIP code	Distance	Delivers to
ZIP code 01355	6.2 mi	New Salem, MA
ZIP code 01005	6.9 mi	Barre, MA
ZIP code 01468	7.4 mi	Templeton, MA
ZIP code 01331	7.6 mi	Athol, MA
ZIP code 01074	8.7 mi	South Barre, MA
ZIP code 01438	9.3 mi	East Templeton, MA
ZIP code 01094	9.4 mi	Wheelwright, MA
ZIP code 01436	9.6 mi	Baldwinville, MA

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 01366, plotted from its record coordinates.

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

Scope ZIP code 01366. 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.