This page helps users with a property search in Winnebago County, Illinois by explaining where to look up parcel details, map-based property information, and assessment-related help.

The main official resources are the Winnebago County Supervisor of Assessments Parcel Details Inquiry and the WinGIS property search map.

Winnebago County Supervisor of Assessments Parcel Details Inquiry

The Winnebago County Supervisor of Assessments Parcel Details Inquiry lets users search current parcel information and historical parcel information back through 2003.

You can search by one of these categories:

  • Parcel Identification Number, using Pin 1, Pin 2, Pin 3, and Pin 4 fields.
  • Parcel location, using number, direction, street, and suffix fields.
  • Owner's name, using last name and first name fields.

Use the search option that matches the information you already have. A parcel number is usually the most direct route when available, while owner name or property location can help when the parcel number is not known.

WinGIS property search map

For map-based property review, use the Winnebago County Public Layers property search map. This resource is part of WinGIS and is useful when the property search depends on location, parcel boundaries, or nearby map context.

Service notice: the WinGIS sites are scheduled to be unavailable on Monday, June 22, at 5:00 PM for server maintenance.

Supervisor of Assessments office role

The Supervisor of Assessments serves taxpayers, Township Assessors, and the Board of Review. The office handles assessment processing, exemptions, tax maps, assessment change notices, and questions about understanding the assessment process.

The office also maintains homestead exemption records and acts as an equalization authority so assessments for property taxation are fair and equitable. Users who need help beyond an online parcel search can contact the office for assessment-related questions.

Sales and parcel information resources

The Supervisor of Assessments website includes parcel information search access, Board of Review information, equalization resources, Winnebago County sales, property tax exemptions, Township Assessor information, and FAQs.

The 2025 Winnebago County Sales information is listed in PDF and Excel formats on the Supervisor of Assessments website.

Property search contact information

Use the Supervisor of Assessments contact information for parcel inquiry, assessment, exemption, tax map, and property search questions.

  • Winnebago County Supervisor of Assessments, 404 Elm Street, Room 301, Rockford, IL 61101
    Phone: (815) 319-4460
    Email: [email protected]
    Hours: Monday through Friday 8:00 AM - 5:00 PM
  • Winnebago County Administration Building, 404 Elm Street, Rockford, IL 61101
    Phone: (815) 319-4444
    Hours: 8 a.m. - 5 p.m.

Common questions

Where can I search Winnebago County parcel details online?

Use the Supervisor of Assessments Parcel Details Inquiry to search by parcel number, parcel location, or owner's name.

Can I view older parcel information?

Yes. The Parcel Details Inquiry includes current parcel information and historical parcel information through 2003.

Which tool should I use for map-based property research?

Use the WinGIS property search map when you need a map view or property location context.

Who handles assessment and exemption questions?

The Winnebago County Supervisor of Assessments handles assessment processing, homestead exemption records, tax maps, assessment change notices, and taxpayer questions about the assessment process.

What are the Supervisor of Assessments office hours?

The office is open Monday through Friday from 8:00 AM to 5:00 PM.