ZIP Code 21641

21641 is one of Maryland's ZIP codes, delivering to addresses in Hillsboro, Caroline County.

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

Where this code sits

21641 is part of the 216xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Hillsboro.

Hillsboro Maryland ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21641 delivers to without sharing its boundary.

ZIP codes nearest 21641

The ZIP codes whose reference points sit closest to 21641.
ZIP code	Distance	Delivers to
ZIP code 21657	2.7 mi	Queen Anne, MD
ZIP code 21660	3.8 mi	Ridgely, MD
ZIP code 21625	4.9 mi	Cordova, MD
ZIP code 21629	7.0 mi	Denton, MD
ZIP code 21679	7.7 mi	Wye Mills, MD
ZIP code 21639	7.7 mi	Greensboro, MD
ZIP code 21636	11 mi	Goldsboro, MD
ZIP code 21617	11 mi	Centreville, 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 21641, plotted from its record coordinates.

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

Scope ZIP code 21641. 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.