ZIP Code 21638

21638 is one of Maryland's ZIP codes, delivering to addresses in Grasonville, Queen Anne's County.

City: Grasonville
County: Queen Anne's County
State: Maryland
Prefix: 216xx

Where this code sits

21638 is part of the 216xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Grasonville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21638 delivers to without sharing its boundary.

ZIP codes nearest 21638

The ZIP codes whose reference points sit closest to 21638.
ZIP code	Distance	Delivers to
ZIP code 21619	4.6 mi	Chester, MD
ZIP code 21658	5.0 mi	Queenstown, MD
ZIP code 21679	6.5 mi	Wye Mills, MD
ZIP code 21666	7.4 mi	Stevensville, MD
ZIP code 21656	8.4 mi	Price, MD
ZIP code 21690	8.4 mi	Chestertown, MD
ZIP code 21624	8.4 mi	Claiborne, MD
ZIP code 21647	9.8 mi	Mcdaniel, 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 21638, plotted from its record coordinates.

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

Scope ZIP code 21638. 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.