Maryland ZIP codes

All 605 ZIPs in Maryland, 20588 to 21930. Tap one on the map or in the list.

605

ZIP codes

6,205,597

people live in them

counties

128

PO Box & no-area ZIPs

Most people

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All 605 Maryland ZIP codes

ZIP codes by county

Pick a county for its ZIP list and map. Counts include ZIPs that only partly reach into the county.

Questions people actually ask

How many ZIP codes are in Maryland?

605 ZIP codes are in use in Maryland. 477 cover a delivery area, and 128 are PO Box, single-building or organization ZIPs with no area of their own.

What do Maryland ZIP codes start with?

Maryland ZIP codes start with these three-digit prefixes: 205–212, 214–219. Each prefix is a mail sorting area run from one processing center.

Which Maryland ZIP code has the most people?

20906 in Silver Spring has the most residents of any Maryland ZIP, about 70,595 people in the Census Bureau’s ACS 2020–2024 estimates.

Which Maryland county has the most ZIP codes?

Montgomery County touches 83 ZIP codes, the most of the 24 counties in Maryland. 81 Maryland ZIPs reach into more than one county.

Are these the official USPS ZIP code boundaries?

The map uses Census ZIP Code Tabulation Areas, the standard public stand-in for USPS delivery areas. They match for almost every home. For a mailing address, the USPS ZIP Code lookup has the final word.

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Updated 2026-11-10 · Where the data comes from