This page helps with Property Search tasks in St. Clair County, Illinois by pointing you to the official parcel, tax, map, and assessment resources used for local property information.

Start with the St. Clair County Property Tax Inquiry for parcel, owner, address, sales, advanced, and mobile home searches. Use the Parcel Map Viewer when you need a map-based way to locate or compare parcels.

St. Clair County Property Tax Inquiry

The St. Clair County Property Tax Inquiry is the main online search tool for parcel and mobile home property records. It can be used to search by parcel number, owner name, site address, sale criteria, property class, township, tax district, tax year, or mobile home number.

  • 11 digit parcel number or owner name
  • House number, street name, and city for an address search
  • Sale price range or sale date range for a sales search
  • Property class, township, tax district, or tax year for an advanced search
  • Mobile home number, owner name, or site address for a mobile home search

Use the search type that matches the information you already have.

  • Choose Basic Search, Address Search, Sales Search, Advanced Search, or Mobile Home Search.
  • Enter the parcel, owner, address, sale, tax year, or mobile home details.
  • Clear the form if you need to switch search details.
  • Review the returned parcel information for assessment, tax, and ownership details.

The inquiry page states that county data is provided without warranties and should be read carefully before relying on search results.

Parcel map viewer

The St. Clair County Parcel Map Viewer is useful when you want to find parcels visually. The viewer includes map layers, a legend, drawing tools, print tools, and measurement tools.

The county’s map disclaimer says spatial and content accuracy are not guaranteed, and map data can change without notice. Use the map as a navigation and research aid, then confirm parcel details through the property inquiry or the appropriate county office when needed.

Assessment and property record details

The St. Clair County Assessor’s Office administers real property assessments. The Assessor’s focus is property value, not tax collection or tax rates. The office also applies qualified exemptions, certifies the completed assessment roll to the Board of Review, and defends assessment decisions when appeals are made.

Real property in St. Clair County is assessed on a quadrennial basis, with assessment work alternated among 22 townships. The Assessor’s page also identifies the Parcel & Mobile Home Search, homestead exemption information, documents and forms, publication dates, and assessment FAQs as department tools.

GIS and other map tools

St. Clair County GIS maintains an enterprise geodatabase with parcels, tax assessment information, cadastral data, street centerlines, address points, incorporated places, townships, voting precincts, and county board districts.

The county’s parcel and map information page says Parcel Inquiry provides access to Assessor and Treasurer parcel database information, including parcel assessments, taxes, and ownership. Map tools support visual parcel research and related map searches.

  • Parcel Map Viewer for parcel location and map-based research
  • Zoning Map Viewer for zoning map research
  • County Board District Map for district boundaries
  • Trustee Parcel Map for trustee parcel information

Payments and tax bill lookup

The online payment system lets users search for a bill by parcel or mobile home number, name, or address. After locating a bill, users can add one or more bills to a cart, review the cart, then check out as a guest or through an account.

Convenience fees listed for online payments are 2.5% or a $2.00 minimum for Visa, MasterCard, Discover, and American Express, and $1.50 for ACH electronic check payments. Fees are retained by the processor and are not collected by the County Treasurer.

Corrected bills with new due dates cannot be honored through the online payment or Autoagent system. The payment page directs users to pay those at the Treasurer’s Office to avoid penalty.

Assessment questions and appeals

For questions about a property’s assessed value, exemptions, square footage, ownership verification, or comparable sales, the Assessor’s Office is the first place to check. The Assessor’s FAQ explains that assessed value is one-third of fair market value, and equalized assessed value is the basis for property tax bills after applicable homeowner exemptions are deducted.

If a property owner believes an assessment is out of line with similar properties, the Board of Review page recommends starting with an informal review through the County Assessor’s Office. A formal appeal may then be filed with the Board of Review when needed.

Evidence for an appeal may include exterior photos, comparable property record cards, a recent appraisal report, a sales contract, a settlement statement, or a deed. Evidence must be submitted to the Board of Review office at least 5 days before the scheduled hearing.

Property document copies

For copies of recorded documents, including deeds, the Recorder of Deeds handles copy requests. Copies of most documents recorded from January 1986 forward are available online for a small fee through the county’s listed remote record access options.

Copy requests must include the correct document number or book and page number. Requests for under 10 non-certified copies can be made by email or phone when the documents are not already available online. Certified copies and requests for 10 or more documents must be mailed with the required payment.

Copy type Fee
Standard copies $2.00 per page
Full plats $5.00 per page
30x36 plats $10.00 for the first page; each additional page is $5.00
UCC copies $1.00 per page
State and federal tax lien copies $1.00 per page
Certified copy of DD214 Free

St. Clair County property search contacts

Use these county contacts when online results are unclear, when you need assessment help, or when your next step must be handled by a county office.

Common questions

Where can I search St. Clair County property records online?

Use the Property Tax Inquiry search to look up parcel, owner, address, sales, advanced, tax year, and mobile home information.

Can I search by map instead of by owner or parcel number?

Yes. The Parcel Map Viewer lets users search visually with map layers, drawing, print, and measurement tools. Confirm details through the parcel inquiry or a county office when accuracy matters.

Who handles property value questions?

The St. Clair County Assessor’s Office handles real property assessments and can assist with property record cards, ownership verification, exemptions, and comparable sales questions.

Does the Assessor collect property taxes?

No. The Assessor’s Office focuses on property value. It does not calculate taxes, set tax rates, or collect taxes.

Where is my PIN listed?

The Assessor’s FAQ identifies the PIN as the Parcel Index Number. It can be found on the parcel inquiry page or on the top right corner of the property tax bill as the Parcel NO.

What should I do if I think my assessment is wrong?

Start with an informal review through the County Assessor’s Office. If needed, you may file an appeal with the Board of Review and provide evidence before your scheduled hearing.

Can I pay a St. Clair County property tax bill online?

Yes. The online payment system lets users find a bill by parcel or mobile home number, name, or address, add bills to a cart, and check out. Payment processing may take three to five business days.

How do I get a copy of a deed?

Contact the Recorder of Deeds for deed copy requests. Copy requests need the correct document number or book and page number, and certified or larger requests must be mailed with payment.