Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. Every office link was opened and checked against the office's own site between September 23, 2026 and October 4, 2026.
O'Fallon, Illinois, in St. Clair County, has about 32,000 residents (2024 Census Bureau estimate). The title to a parcel in O'Fallon is in the deed records of the County Recorder and its taxable value is set by the Supervisor of Assessments; what is built on it is a matter for the city. This guide says who keeps each record and where the page for each office is.
This guide covers deeds, assessed values, city permits and records, evictions and court cases, records requests, directory links and common questions.
Related guides: O'Fallon public records, St. Clair County property records, O'Fallon arrest records, O'Fallon warrants, O'Fallon inmate search, Illinois arrest records and Illinois inmate search.
Deeds, Mortgages and Liens in O'Fallon
Deeds, mortgages, liens and easements that affect title to land in O'Fallon are recorded by the County Recorder, which indexes them by name and sells copies.
SearchSystems opened and checked the County Recorder's page at co.st-clair.il.us/departments/recorder-of-deeds (page title: Recorder of Deeds | Departments | St. Clair), phone (618) 825-2481, 10 Public Sq, 5th Floor Belleville, IL 62222, which answered when SearchSystems opened it on September 23, 2026.
Assessed Values and the Tax Roll in O'Fallon
What a parcel in O'Fallon is taxed on is the business of the Supervisor of Assessments, which also keeps the parcel maps. Illinois assesses property at a third of market value; Cook County reassesses one third of the county each year and the rest of the state runs on four-year cycles.
SearchSystems opened and checked the Supervisor of Assessments' page at co.st-clair.il.us/departments/assessor (page title: Assessor | Departments | St. Clair), phone 618-825-2704, which answered when SearchSystems opened it on September 23, 2026.
Permits and City Records in O'Fallon
Building permits, zoning and code cases are the city's own. For O'Fallon, SearchSystems opened and checked the city hall page at ofallon.org (page title: O'Fallon, IL), which answered when SearchSystems opened it on September 25, 2026.
The city clerk's page SearchSystems verified is at ofallon.org/170/City-Clerk (page title: City Clerk | O'Fallon, IL), phone 618-624-4500, 8716 City Clerk Physical Address 255 S Lincoln Avenue O'Fallon, IL 62269, Monday through Friday, from 8 am to 5 pm., which answered when SearchSystems opened it on September 25, 2026.
Evictions and Court Cases About Land in O'Fallon
An eviction, a foreclosure, a lien dispute or a quiet title suit is a court case in the Circuit Court of St. Clair County, and the file is public unless sealed.
Asking a County Office for a Record
Under the Illinois Freedom of Information Act a county office must answer a request within 5 business days, with one 5-day extension, and it may charge copying only after the first 50 pages. The county records request page SearchSystems verified is at stclaircountyil.justfoia.com/publicportal/home/newrequest (page title: St. Clair County, IL Public Portal | JustFOIA).
More Official Property and Land Records Pages for St. Clair County
The SearchSystems directory, online since 1997, lists the official pages for St. Clair County and Illinois. These property pages from its St. Clair County listing were opened again on October 2, 2026 and each one still answers:
- Parcels and Maps (co.st-clair.il.us)
Frequently Asked Questions
Who records deeds in O'Fallon?
The County Recorder, at co.st-clair.il.us, phone (618) 825-2481. Deeds, mortgages and liens on land in O'Fallon are filed there, and the Supervisor of Assessments (co.st-clair.il.us/departments/assessor) has the assessment records.
Who sets the assessed value of a property in O'Fallon?
The Supervisor of Assessments, whose page SearchSystems verified is at co.st-clair.il.us/departments/assessor.
Where are evictions from O'Fallon filed?
In the Circuit Court of St. Clair County. The file is public unless the court seals it.
How is property assessed in Illinois?
Illinois assesses property at a third of market value; Cook County reassesses one third of the county each year and the rest of the state runs on four-year cycles.
Is this the official O'Fallon website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.