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ZIP codes in Fond du Lac County

25 ZIPs touch Fond du Lac County, Wisconsin. The blue dashed line is the county border; orange ZIPs reach into it.

25

ZIP codes

16

cross the county line

169,495

people in these ZIPs

72

counties in WI

Most people

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Fond du Lac County ZIP list

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Questions people actually ask

How many ZIP codes are in Fond du Lac County, Wisconsin?

25 ZIP codes reach into Fond du Lac County, including 1 PO Box or single-address ZIPs placed by the town they serve. 16 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Fond du Lac County has the most people?

54935 (Fond Du Lac) has about 41,613 residents, the most of any ZIP touching Fond du Lac County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Fond du Lac 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 Fond du Lac 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