Winnebago County, Wisconsin
Winnebago County is a county in Wisconsin. Its county FIPS code is 55139. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 55139
- Representative coordinates
- 44.085707, -88.668149
- County type
- County
- County seat or government
- Oshkosh
- Resident population, July 2025
- 174,218
- Land area
- 1,125.861 km²
- Water area
- 372.63 km²
- State
- Wisconsin
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Winnebago County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
54901 · 54902 · 54904 · 54914 · 54915 · 54923 · 54927 · 54940 · 54947 · 54952 · 54956 · 54963 · 54964 · 54971 · 54979 · 54980 · 54985 · 54986
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Winnebago County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
Areas sharing the mapped boundary
These areas touch this mapped boundary.
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