ZIP Code 21721

21721 is one of Maryland's ZIP codes, delivering to addresses in Chewsville, Washington County.

City: Chewsville
County: Washington County
State: Maryland
Prefix: 217xx

Where this code sits

21721 is part of the 217xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Chewsville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21721 delivers to without sharing its boundary.

ZIP codes nearest 21721

The ZIP codes whose reference points sit closest to 21721.
ZIP code	Distance	Delivers to
ZIP code 21720	2.8 mi	Cavetown, MD
ZIP code 21742	3.1 mi	Hagerstown, MD
ZIP code 21783	3.6 mi	Smithsburg, MD
ZIP code 21734	4.3 mi	Funkstown, MD
ZIP code 21741	4.4 mi	Hagerstown, MD
ZIP code 21747	4.4 mi	Hagerstown, MD
ZIP code 21749	4.4 mi	Hagerstown, MD
ZIP code 21740	5.4 mi	Hagerstown, 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 21721, plotted from its record coordinates.

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

Scope ZIP code 21721. 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.