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ZIP codes in Iowa County

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

21

ZIP codes

12

cross the county line

54,944

people in these ZIPs

72

counties in WI

Most people

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Iowa County ZIP list

More counties in Wisconsin

All 72 counties in Wisconsin

Questions people actually ask

How many ZIP codes are in Iowa County, Wisconsin?

21 ZIP codes reach into Iowa County, including 2 PO Box or single-address ZIPs placed by the town they serve. 12 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Iowa County has the most people?

53818 (Platteville) has about 16,024 residents, the most of any ZIP touching Iowa County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Iowa 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 Iowa 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