ZIP Code 01866

01866 is one of Massachusetts's ZIP codes, delivering to addresses in Pinehurst, Middlesex County.

City: Pinehurst
County: Middlesex County
State: Massachusetts
Prefix: 018xx

Where this code sits

01866 is part of the 018xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Pinehurst.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 01866 delivers to without sharing its boundary.

ZIP codes nearest 01866

The ZIP codes whose reference points sit closest to 01866.
ZIP code	Distance	Delivers to
ZIP code 01821	2.0 mi	Billerica, MA
ZIP code 01803	2.0 mi	Burlington, MA
ZIP code 01865	2.2 mi	Nutting Lake, MA
ZIP code 01805	2.4 mi	Burlington, MA
ZIP code 01822	2.9 mi	Billerica, MA
ZIP code 01887	3.5 mi	Wilmington, MA
ZIP code 01730	4.0 mi	Bedford, MA
ZIP code 01862	4.5 mi	North Billerica, 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 01866, plotted from its record coordinates.

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

Scope ZIP code 01866. 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.