ZIP Code 21810

21810 is one of Maryland's ZIP codes, delivering to addresses in Allen, Wicomico County.

City: Allen
County: Wicomico County
State: Maryland
Prefix: 218xx

Where this code sits

21810 is part of the 218xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Allen.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21810 delivers to without sharing its boundary.

ZIP codes nearest 21810

The ZIP codes whose reference points sit closest to 21810.
ZIP code	Distance	Delivers to
ZIP code 21822	2.1 mi	Eden, MD
ZIP code 21826	4.3 mi	Fruitland, MD
ZIP code 21856	6.2 mi	Quantico, MD
ZIP code 21853	6.7 mi	Princess Anne, MD
ZIP code 21801	7.2 mi	Salisbury, MD
ZIP code 21802	7.7 mi	Salisbury, MD
ZIP code 21803	7.7 mi	Salisbury, MD
ZIP code 21830	8.0 mi	Hebron, 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 21810, plotted from its record coordinates.

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

Scope ZIP code 21810. 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.