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City ZIP codes · Wisconsin

Oshkosh, WI ZIP Codes

5 ZIP codes use the postal name Oshkosh, Wisconsin (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 3 residential and 2 for PO boxes or a single organization. Median household income runs from $61,794 in 54901 to $93,341 in 54904, 1.5 times as much (Census Bureau, ACS 2020-2024). Oshkosh's most populous ZIP code is 54901, with 37,294 people (ACS 2020-2024); 63% of its land is in the city of Oshkosh.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Oshkosh's ZIP codes?

54901: $62k median household income54902: $66k median household income54904: $93k median household income54904549025490154901: $62k median household income54902: $66k median household income54904: $93k median household income54904549025490154901: $62k median household income54902: $66k median household income54904: $93k median household income549045490254901
The 3 residential ZIP codes named Oshkosh, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are Oshkosh's ZIP codes?

The highest median household income is in 54904 ($93,341), the lowest in 54901 ($61,794). Home values run from $170,800 in 54902 to $281,000 in 54904.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 3 residential ZIP codes of Oshkosh

Residential ZIP codes with the postal name Oshkosh, WI, largest first (ACS 2020-2024); sort by any column
County
54901 Winnebago County 37,294 2,241 $62k $178k
54904 Winnebago County 22,273 286 $93k $281k
54902 Winnebago County 22,243 635 $66k $171k

Download the 5 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Oshkosh

2 ZIP codes named Oshkosh have no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Oshkosh, WI: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
54903Winnebago County
54906Winnebago County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Oshkosh's ZIP codes reach?

Oshkosh's residential ZIP codes lie in Winnebago County.

Which first three digits do Oshkosh's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Oshkosh starts with 549.

Three-digit prefixes of Oshkosh's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Oshkosh's
PrefixSectional centerHereAll codes
549 Milwaukee, WI (SCF 530) 5 66

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.