ZIP Code 01863

01863 is one of Massachusetts's ZIP codes, delivering to addresses in North Chelmsford, Middlesex County.

City: North Chelmsford
County: Middlesex County
State: Massachusetts
Prefix: 018xx

Where this code sits

01863 is part of the 018xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to North Chelmsford.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 01863 delivers to without sharing its boundary.

ZIP codes nearest 01863

The ZIP codes whose reference points sit closest to 01863.
ZIP code	Distance	Delivers to
ZIP code 01879	2.9 mi	Tyngsboro, MA
ZIP code 01851	3.0 mi	Lowell, MA
ZIP code 01854	3.0 mi	Lowell, MA
ZIP code 01824	3.5 mi	Chelmsford, MA
ZIP code 01853	3.8 mi	Lowell, MA
ZIP code 01886	4.2 mi	Westford, MA
ZIP code 01850	4.6 mi	Lowell, MA
ZIP code 01826	4.7 mi	Dracut, 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 01863, plotted from its record coordinates.

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

Scope ZIP code 01863. 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.