ZIP Code 01721

01721 is one of Massachusetts's ZIP codes, delivering to addresses in Ashland, Middlesex County.

City: Ashland
County: Middlesex County
State: Massachusetts
Prefix: 017xx

Where this code sits

01721 is part of the 017xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ashland.

Ashland Massachusetts ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 01721 delivers to without sharing its boundary.

ZIP codes nearest 01721

The ZIP codes whose reference points sit closest to 01721.
ZIP code	Distance	Delivers to
ZIP code 01702	2.3 mi	Framingham, MA
ZIP code 01745	3.6 mi	Fayville, MA
ZIP code 01701	3.6 mi	Framingham, MA
ZIP code 01746	3.7 mi	Holliston, MA
ZIP code 01770	4.3 mi	Sherborn, MA
ZIP code 01748	4.4 mi	Hopkinton, MA
ZIP code 01772	4.7 mi	Southborough, MA
ZIP code 01784	5.4 mi	Woodville, 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 01721, plotted from its record coordinates.

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

Scope ZIP code 01721. 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.