ZIP Code 01432

01432 is one of Massachusetts's ZIP codes, delivering to addresses in Ayer, Middlesex County.

City: Ayer
County: Middlesex County
State: Massachusetts
Prefix: 014xx

Where this code sits

01432 is part of the 014xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ayer.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 01432 delivers to without sharing its boundary.

ZIP codes nearest 01432

The ZIP codes whose reference points sit closest to 01432.
ZIP code	Distance	Delivers to
ZIP code 01434	2.2 mi	Devens, MA
ZIP code 01470	3.6 mi	Groton, MA
ZIP code 01471	3.6 mi	Groton, MA
ZIP code 01464	3.7 mi	Shirley, MA
ZIP code 01450	3.8 mi	Groton, MA
ZIP code 01472	4.0 mi	West Groton, MA
ZIP code 01451	4.2 mi	Harvard, MA
ZIP code 01460	4.8 mi	Littleton, 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 01432, plotted from its record coordinates.

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

Scope ZIP code 01432. 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.