Caroline County ZIP Codes

Caroline County is a county of Maryland.

ZIP codes: 11
Cities & towns: 11
Area codes: 3
Land area: 319 sq mi

Every ZIP code in Caroline County

216xx

The complete list of Caroline County, MD ZIP codes with the city each one delivers to.
ZIP code	City
21609	Bethlehem
21629	Denton
21632	Federalsburg
21636	Goldsboro
21639	Greensboro
21640	Henderson
21641	Hillsboro
21649	Marydel
21655	Preston
21660	Ridgely
21670	Templeville

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Caroline County codes above are listed without a column we would have to invent.

Cities and towns in Caroline County

A further 1 place in Caroline County appears in the postal source without a page of its own; its codes are in the table above and each one links to its own page.

Area codes covering Caroline County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Caroline County's ZIP codes sit

Each point is the reference point of one Caroline County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

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

Scope every ZIP code recorded in Caroline County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.