ZIP Code 21840

21840 is one of Maryland's ZIP codes, delivering to addresses in Nanticoke, Wicomico County.

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

Where this code sits

21840 is part of the 218xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Nanticoke.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21840 delivers to without sharing its boundary.

ZIP codes nearest 21840

The ZIP codes whose reference points sit closest to 21840.
ZIP code	Distance	Delivers to
ZIP code 21814	2.0 mi	Bivalve, MD
ZIP code 21865	3.2 mi	Tyaskin, MD
ZIP code 21856	7.8 mi	Quantico, MD
ZIP code 21821	8.3 mi	Deal Island, MD
ZIP code 21627	8.4 mi	Crocheron, MD
ZIP code 21672	8.6 mi	Toddville, MD
ZIP code 21675	10 mi	Wingate, MD
ZIP code 21810	12 mi	Allen, 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 21840, plotted from its record coordinates.

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

Scope ZIP code 21840. 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.