Fond du Lac, WI ZIP Codes
Fond du Lac, Wisconsin has 3 ZIP codes: 2 for street addresses ( and ) and 1 for PO boxes ().
Your street decides which one you use.
Which Fond du Lac ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Fond du Lac ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
54936 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: Fond du Lac city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Fond du Lac ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 54935 | street delivery Fond du Lac |
| 54936 | PO boxes at the Fond du Lac post office Fond du Lac |
| 54937 | street delivery Fond du Lac |
Why your mail may say Fond du Lac when you live outside it
Fond du Lac ZIP codes also cover Empire, Byron and Lamartine, so a letter addressed to Fond du Lac can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Fond du Lac County property records show which city you are in.
Fond du Lac ZIP code questions
What is the main ZIP code for Fond du Lac?
54935, the ZIP code of the main Fond du Lac post office at 99 W 2nd St.
Which Fond du Lac ZIP codes are for PO boxes only?
54936. Mail to it goes to boxes at the post office, not to street addresses.
What county is Fond du Lac in?
Fond du Lac County.
ZIP codes for towns near Fond du Lac
More towns near Fond du Lac: Brookfield, Wauwatosa, Waukesha, Milwaukee, Green Bay, West Allis, Sun Prairie, New Berlin, Greenfield.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections