Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/WI/COUNTY/WINNEBAGO

Winnebago County, WI ZIP codes

There are 15 ZIP codes in Winnebago County, WI, in 10 towns, from 54901 to 54986. The largest are 54956 (Neenah), 54901 (Oshkosh) and 54904 (Oshkosh). 2 more cross into it from neighbouring counties: 54971 and 54940.

The county seat is Oshkosh.

ZIP codes
15
Partly in it
2 more
Towns
10
County seat
Oshkosh
County FIPS
55139
Population
171,769
Median household income
$74,925
Land area
435 sq mi
Area codes
274, 920
Metro area
Oshkosh-Neenah

Winnebago County ZIP codes by town

Oshkosh (county seat)
54901, 54902, 54903, 54904, 54906

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Winnebago County

These ZIP codes lie mostly in a neighbouring county but each cover a twentieth or more of Winnebago County.

Map of Winnebago County ZIP codes

549015490254903549045490654927549345494754956549575496354964549805498554986

The ZIP codes of Winnebago County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Winnebago County in numbers

About 171,769 people live in Winnebago County, in 72,667 households, the 7th most populous of Wisconsin's 72 counties. The median household income is $74,925 a year, 3% below the Wisconsin median of $77,485 (US: $80,734). The median owner-occupied home is valued at $225,800 (15% below the Wisconsin median), and median gross rent is $965 a month. The median age is 38.7; 31.1% of adults 25 and over hold a bachelor's degree or higher (33.4% across Wisconsin); the average commute takes 19 minutes.

Population171,769Winnebago171,769
Households72,667Winnebago72,667
Median age38.7Winnebago38.7Wisconsin40.2US 38.9
Median household income$74,925Winnebago$74,925Wisconsin$77,485US $80,734
Median home value$225,800Winnebago$225,800Wisconsin$266,500US $332,700
Median gross rent$965Winnebago$965Wisconsin$1,087US $1,413
Bachelor's degree or higher31.1%Winnebago31.1%Wisconsin33.4%US 35.7%
Mean commute19.4 minWinnebago19.4 minWisconsin22.2 minUS 26.4 min
Population density395 / sq miWinnebago395 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Winnebago County

Largest towns in Winnebago County
TownZIP codesPopulation
Oshkosh 5 66,729
Neenah 2 27,336
Omro 1 3,642
Winneconne 1 2,511
Larsen 1 2,323
Butte Des Morts 1 1,064
Pickett 1 974
Waukau 1 325
Winnebago 1 249
Eureka 1 167

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Winnebago County.

Not sure you are in Winnebago County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Winnebago County, with figures

ZIP codes in Winnebago County
ZIP City Type Population Median income Median home
54901 Oshkosh , WI Standard 37,294 $61,794 $177,700
54902 Oshkosh , WI Standard 22,243 $65,612 $170,800
54903 Oshkosh , WI No street area — — —
54904 Oshkosh , WI Standard 22,273 $93,341 $281,000
54906 Oshkosh , WI No street area — — —
54927 Butte Des Morts , WI Standard 540 $128,523 $244,200
54934 Eureka , WI No street area — — —
54947 Larsen , WI Standard 2,323 $91,167 $280,400
54956 Neenah , WI Standard 46,567 $85,869 $256,900
54957 Neenah , WI No street area — — —
54963 Omro , WI Standard 7,271 $86,227 $238,200
54964 Pickett , WI Standard 974 $82,857 $268,300
54980 Waukau , WI Standard 218 $31,711 $190,100
54985 Winnebago , WI Standard 249 — —
54986 Winneconne , WI Standard 5,394 $93,189 $300,900

Cite this page

zipcodes.pro. “Winnebago County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wi/county/winnebago

Underlying data is public domain or openly licensed — sources, vintages and licences.