ZIP Code 21655

21655 is one of Maryland's ZIP codes, delivering to addresses in Preston, Caroline County.

City: Preston
County: Caroline County
State: Maryland
Prefix: 216xx

Where this code sits

21655 is part of the 216xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Preston.

Preston Maryland ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21655 delivers to without sharing its boundary.

ZIP codes nearest 21655

The ZIP codes whose reference points sit closest to 21655.
ZIP code	Distance	Delivers to
ZIP code 21609	2.3 mi	Bethlehem, MD
ZIP code 21643	7.7 mi	Hurlock, MD
ZIP code 21632	7.9 mi	Federalsburg, MD
ZIP code 21601	8.8 mi	Easton, MD
ZIP code 21629	8.9 mi	Denton, MD
ZIP code 21673	9.2 mi	Trappe, MD
ZIP code 21664	9.6 mi	Secretary, MD
ZIP code 21625	9.7 mi	Cordova, 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 21655, plotted from its record coordinates.

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

Scope ZIP code 21655. 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.