Oshkosh, WI ZIP Codes
Oshkosh, Wisconsin has 5 ZIP codes: 3 for street addresses (, and ), 1 for PO boxes () and 1 for a single organization.
Your street decides which one you use.
Which Oshkosh 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?
Oshkosh ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
54903 and 54906 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Oshkosh city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Oshkosh ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 54901 | street delivery Oshkosh Carrier Annex |
| 54902 | street delivery Oshkosh Carrier Annex |
| 54903 | PO boxes at the Downtown Oshkosh post office Downtown Oshkosh |
| 54904 | street delivery Oshkosh Carrier Annex |
| 54906 | one organization Oshkosh |
Why your mail may say Oshkosh when you live outside it
Oshkosh ZIP codes also cover Nekimi, Black Wolf and Vinland, so a letter addressed to Oshkosh can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Winnebago County property records show which city you are in.
Oshkosh ZIP code questions
What is the main ZIP code for Oshkosh?
54901, the ZIP code of the main Oshkosh Carrier Annex post office at 1900 Venture Dr.
Which Oshkosh ZIP codes are for PO boxes only?
54903. Mail to it goes to boxes at the post office, not to street addresses.
What county is Oshkosh in?
Winnebago County.
ZIP codes for towns near Oshkosh
More towns near Oshkosh: Menomonee Falls, Sun Prairie, Brookfield, Wauwatosa, Waukesha, Milwaukee, West Allis, New Berlin, Madison.
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