ZIP Code 01431

01431 is one of Massachusetts's ZIP codes, delivering to addresses in Ashby, Middlesex County.

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

Where this code sits

01431 is part of the 014xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ashby.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 01431 delivers to without sharing its boundary.

ZIP codes nearest 01431

The ZIP codes whose reference points sit closest to 01431.
ZIP code	Distance	Delivers to
ZIP code 01474	3.3 mi	West Townsend, MA
ZIP code 01430	5.8 mi	Ashburnham, MA
ZIP code 03048	5.8 mi	Greenville, NH
ZIP code 03071	5.9 mi	New Ipswich, NH
ZIP code 01420	6.6 mi	Fitchburg, MA
ZIP code 01469	6.7 mi	Townsend, MA
ZIP code 01462	7.5 mi	Lunenburg, MA
ZIP code 03033	8.9 mi	Brookline, NH

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 01431, plotted from its record coordinates.

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

Scope ZIP code 01431. 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.