Wisconsin Property Tax Assessors

Winnebago County, Wisconsin Tax Assessors' Office

Winnebago County Assessors Phone Number
Winnebago County Treasurer - Property Lister
415 Jackson Street, Room 120
Oshkosh, Wisconsin 54901

Where is the Winnebago County Tax Assessor's Office?

The Winnebago County Tax Assessor, Treasurer, Real Property Lister & Delinquent Property Taxes Office is located at 415 Jackson Street, Room 120, at the County Courthouse building in Oshkosh, Wisconsin.

While many counties have county-wide tax assessors, Winnebago County has two cities and towns with their own local tax assessors. If your property is located within any of these localities, see that page for your tax assessor's contact information.

What can the Winnebago County Assessor's Office do for me?

The Winnebago County Tax Assessor's Office oversees the appraisal and assessment of properties as well as the billing and collection of property taxes for all taxable real estate located in Winnebago County.

Contact the assessor's office if you need help with paying your property taxes, applying for a homestead exemption or other tax exemption, reporting upgrades to your home, appealing your property tax assessment, or verifying your property records.

Submitting a Winnebago County property tax appeal

If you believe that your house has been unfairly overappraised (i.e. appraised at a value higher than the true market value of the property), you can attempt to get your home re-appraised at a lower value by contacting the Assessor's Office to submit a property tax appeal.

You will have to submit a form describing your property and sufficient proof that it is overassessed, including valuations of similar homes nearby as evidence. If your appeal is accepted, your home assessment (and property taxes) will be lowered as a result.

If you would like to appeal your property, call the Winnebago County Assessor's Office at (920) 236 4778 and ask for a property tax appeal form. Keep in mind that property tax appeals are generally only accepted in a 1-3 month window each year.

For more information and example appeals, see how to appeal your property taxes.

Useful Winnebago County Facts:

The median home value in Winnebago County is between $138,891.00 and $142,109.00. Property tax rates are based on property values.

How can I contact Winnebago County?

You can try contacting the Winnebago County local government directly with any issues the Assessor's Office can't solve. In many counties, certain property records such as deeds are kept in the county courthouse or county archives instead of at the tax assessors' office.

The county seat for Winnebago County is located in the County Courthouse in Oshkosh, which is where the Winnebago County Assessors' Office is also located. You can direct your general inquiries to Winnebago County with the contact info listed below.

Winnebago County Phone Number


Winnebago County Fax Number


Winnebago County County Courthouse Address

County Courthouse
415 Jackson St
Oshkosh, WI 54901-4751