Maryland ZIP Codes

ZIP codes: 605
Cities & towns: 431
Counties and independent cities: 24
Area codes: 6

How Maryland ZIP codes are numbered

205xx–219xx

The first three digits identify the sectional center facility that processes mail for a region, so a Maryland ZIP code can be placed geographically from its prefix alone. Each row names the city holding the most codes in that prefix.

Maryland three-digit ZIP prefixes, the codes in each, and the city that holds the most of them.
Prefix	ZIP codes	Main area
205xx	1	Dhs
206xx	68	Waldorf
207xx	79	Bowie
208xx	59	Bethesda
209xx	18	Silver Spring
210xx	58	Columbia
211xx	34	Pasadena
212xx	62	Baltimore
214xx	8	Annapolis
215xx	30	Cumberland
216xx	62	Chestertown
217xx	66	Frederick
218xx	43	Salisbury
219xx	17	Elkton

Where Maryland's communities sit

Each point is a Maryland community with a published ZIP code list, 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

Maryland cities by ZIP code count

largest 25

Area codes serving Maryland

Scope every ZIP code recorded in Maryland. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. The map outline is a convex envelope of published places, not a state boundary.