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ZIP codes in Montgomery County

83 ZIPs touch Montgomery County, Maryland. The blue dashed line is the county border; orange ZIPs reach into it.

83

ZIP codes

11

cross the county line

1,187,640

people in these ZIPs

24

counties in MD

Most people

← All Maryland ZIP codes

Montgomery County ZIP list

More counties in Maryland

All 24 counties in Maryland

Questions people actually ask

How many ZIP codes are in Montgomery County, Maryland?

83 ZIP codes reach into Montgomery County, including 30 PO Box or single-address ZIPs placed by the town they serve. 11 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Montgomery County has the most people?

20906 (Silver Spring) has about 70,595 residents, the most of any ZIP touching Montgomery County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Montgomery County and another county?

Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Montgomery County. For one address, pin the exact spot on the ZIP finder to see its county.

Where does this list come from?

ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.

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