Contact Information
- Office Name:
- Fond du Lac County Assessor
- Phone:
- (920) 929-7021
- Official Website:
- Visit Website
- County FIPS:
- 55039
- Data Available Online:
- Yes
- Last verified:
- 2026-07-13
Searching Fond du Lac County Assessor Records
Data available
Use the county Ascent Real Estate Tax Parcel portal and search by parcel number, site address, or owner's name; leave out spaces and punctuation, and when searching by address omit Road/Avenue/etc., then open the matching parcel hyperlink. For map-based lookup, use the county Desktop/Mobile GIS viewer. Detailed building attributes (age, square footage, etc.) are maintained by local municipal assessors; some municipalities publish that detail via links on the county Assessment Data page (City of Fond du Lac, Ripon, Waupun, Town of Osceola).
Additional Information
Fond du Lac County does not operate a county assessor's office; municipal assessors set values, and the county Real Property Listing office within the Land Information Department maintains ownership, legal descriptions, parcel numbers, and assessed-value data under Wis. Stat. § 70.09. Official Real Property Listing and Assessment Data pages are on fdlco.wi.gov. The public can search land ownership and property tax information at no cost through the Ascent Real Estate Tax Parcel portal (linked from the Treasurer Real Estate and Tax Data Search page), and can view parcels on the county GIS map. Some municipalities also publish detailed assessment data on separate sites.
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