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ZIP codes in Milwaukee County

49 ZIPs touch Milwaukee County, Wisconsin. The blue dashed line is the county border; orange ZIPs reach into it.

49

ZIP codes

4

cross the county line

933,533

people in these ZIPs

72

counties in WI

Most people

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Milwaukee County ZIP list

More counties in Wisconsin

All 72 counties in Wisconsin

Questions people actually ask

How many ZIP codes are in Milwaukee County, Wisconsin?

49 ZIP codes reach into Milwaukee County, including 12 PO Box or single-address ZIPs placed by the town they serve. 4 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Milwaukee County has the most people?

53215 (Milwaukee) has about 58,146 residents, the most of any ZIP touching Milwaukee County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Milwaukee 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 Milwaukee 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