ZIP Code 21890

21890 is one of Maryland's ZIP codes, delivering to addresses in Westover, Somerset County.

City: Westover
County: Somerset County
State: Maryland
Prefix: 218xx

Where this code sits

21890 is part of the 218xx range, the group of codes handled by one mail processing centre. Westover is served by 2 ZIP codes in total.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21890 delivers to without sharing its boundary.

ZIP codes nearest 21890

The ZIP codes whose reference points sit closest to 21890.
ZIP code	Distance	Delivers to
ZIP code 21867	5.3 mi	Upper Fairmount, MD
ZIP code 21821	5.4 mi	Deal Island, MD
ZIP code 21836	7.4 mi	Manokin, MD
ZIP code 21817	7.9 mi	Crisfield, MD
ZIP code 21871	8.0 mi	Westover, MD
ZIP code 21838	8.4 mi	Marion Station, MD
ZIP code 21824	11 mi	Ewell, MD
ZIP code 21866	11 mi	Tylerton, 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 21890, plotted from its record coordinates.

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

Scope ZIP code 21890. 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.