ZIP Code 21521

21521 is one of Maryland's ZIP codes, delivering to addresses in Barton, Allegany County.

City: Barton
County: Allegany County
State: Maryland
Prefix: 215xx

Where this code sits

21521 is part of the 215xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Barton.

Barton Maryland ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21521 delivers to without sharing its boundary.

ZIP codes nearest 21521

The ZIP codes whose reference points sit closest to 21521.
ZIP code	Distance	Delivers to
ZIP code 21562	3.0 mi	Westernport, MD
ZIP code 21539	3.5 mi	Lonaconing, MD
ZIP code 26750	3.8 mi	Piedmont, WV
ZIP code 21540	4.2 mi	Luke, MD
ZIP code 21523	4.4 mi	Bloomington, MD
ZIP code 21542	5.7 mi	Midland, MD
ZIP code 21557	6.5 mi	Rawlings, MD
ZIP code 21543	8.1 mi	Midlothian, MD

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 21521, plotted from its record coordinates.

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

Scope ZIP code 21521. 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.