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.
Warren County, Illinois, has about 16,000 residents (2024 Census Bureau estimate). The title to a parcel in Warren County 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 or the county. This guide says who keeps each record and where the page for each office is.
This guide covers deeds, assessed values, evictions and court cases, records requests and common questions.
Related guides: Warren County public records, Warren County arrest records, Warren County warrants, Warren County inmate search, Warren County criminal records, Illinois arrest records and Illinois inmate search.
Deeds, Mortgages and Liens in Warren County
Who owns a parcel in Warren County and what it sold for are in the deed records of the County Recorder, with every lien or mortgage against the land.
SearchSystems opened and checked the County Recorder's page at warrencountyil.gov/offices/county-clerk-recorder (page title: County Clerk & Recorder | Warren County IL), phone 309-734-8592, Monmouth IL 61462 M-F 8am - 4:30pm, which answered when SearchSystems opened it on September 23, 2026.
Assessed Values and the Tax Roll in Warren County
The Supervisor of Assessments sets the value each parcel in Warren County is taxed on and 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 warrencountyil.gov/offices/supervisor-of-assessment (page title: Supervisor of Assessment | Warren County IL), phone 309-734-8561, Monmouth, IL 61462-1761 Monday - Friday 8:00 a.m. to 4:30 p.m., which answered when SearchSystems opened it on September 23, 2026.
Evictions and Court Cases About Land in Warren County
An eviction, a foreclosure, a lien dispute or a quiet title suit is a court case in the Circuit Court of Warren County, and the file is public unless sealed.
The court records page SearchSystems verified for the county is at warrencountyil.gov/offices/circuit-clerk, phone 309-734-5179.
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.
Frequently Asked Questions
Who records deeds in Warren County?
The County Recorder, at warrencountyil.gov, phone 309-734-8592. Deeds, mortgages and liens on land in Warren County are filed there, and the Supervisor of Assessments (warrencountyil.gov) has the assessment records.
Who sets the assessed value of a property in Warren County?
The Supervisor of Assessments, whose page SearchSystems verified is at warrencountyil.gov.
Where are evictions from Warren County filed?
In the Circuit Court of Warren 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 Warren County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.