ZIP Code 01561

01561 is one of Massachusetts's ZIP codes, delivering to addresses in South Lancaster, Worcester County.

City: South Lancaster
County: Worcester County
State: Massachusetts
Prefix: 015xx

Where this code sits

01561 is part of the 015xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to South Lancaster.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 01561 delivers to without sharing its boundary.

ZIP codes nearest 01561

The ZIP codes whose reference points sit closest to 01561.
ZIP code	Distance	Delivers to
ZIP code 01523	0.5 mi	Lancaster, MA
ZIP code 01510	1.8 mi	Clinton, MA
ZIP code 01740	4.0 mi	Bolton, MA
ZIP code 01564	4.6 mi	Sterling, MA
ZIP code 01467	4.8 mi	Still River, MA
ZIP code 01503	4.8 mi	Berlin, MA
ZIP code 01451	6.8 mi	Harvard, MA
ZIP code 01453	6.8 mi	Leominster, 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 01561, plotted from its record coordinates.

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

Scope ZIP code 01561. 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.