ZIP Code 21864

21864 is one of Maryland's ZIP codes, delivering to addresses in Stockton, Worcester County.

City: Stockton
County: Worcester County
State: Maryland
Prefix: 218xx

Where this code sits

21864 is part of the 218xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Stockton.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21864 delivers to without sharing its boundary.

ZIP codes nearest 21864

The ZIP codes whose reference points sit closest to 21864.
ZIP code	Distance	Delivers to
ZIP code 23356	2.7 mi	Greenbackville, VA
ZIP code 21829	3.7 mi	Girdletree, MD
ZIP code 23395	6.2 mi	Horntown, VA
ZIP code 21851	8.1 mi	Pocomoke City, MD
ZIP code 23336	8.4 mi	Chincoteague Island, VA
ZIP code 23415	8.4 mi	New Church, VA
ZIP code 23483	8.6 mi	Wattsville, VA
ZIP code 23337	9.8 mi	Wallops Island, VA

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 21864, plotted from its record coordinates.

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

Scope ZIP code 21864. 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.