Illinois Public Records Search — Free Official Government Sources

Illinois runs a genuinely split system, and the split is not the usual state-versus-county one — Cook County is large enough to function as its own records jurisdiction. Statewide, the Secretary of State handles corporations, LLCs, and UCC filings; the Treasurer runs the ICASH unclaimed property program; and the State Police maintain the sex offender registry and criminal history services. Everything touching land or litigation sits with the 102 counties, and the size gap between Cook and the rest means a research method that works in Chicago often has no equivalent downstate.

The Freedom of Information Act, 5 ILCS 140, gives any person the right to inspect public records with a five-business-day response deadline, extendable by five more for enumerated reasons. What makes Illinois distinctive is the Public Access Counselor in the Attorney General's office: you can request a binding or advisory opinion on a denial without going to court, and the PAC's opinions are published. Commercial requests are handled on a separate, slower track, so identifying your request as non-commercial matters if you want the standard clock.

Business entity search through the Secretary of State is free and covers status, registered agent, and assumed names, but Illinois charges for certificates of good standing and for many document images, so it is less generous than Florida's Sunbiz. Assumed name (DBA) registration happens at the county clerk rather than the state, which is a common dead end for people searching a storefront name — a step we walk through on the business records hub. Illinois annual reports are due on the anniversary month of formation, and an entity in 'not in good standing' status is often just a missed report rather than a dissolution.

Property records are handled by county assessors, recorders, and — in Cook County — a consolidated Clerk's office that absorbed the Recorder of Deeds in December 2020. Illinois is a disclosure state: a PTAX-203 real estate transfer declaration accompanies each deed and records the actual sale price, and county sales data derives from it. Court records are the weak point. There is no free unified statewide portal for the public; re:SearchIL exists but is restricted to attorneys, judges, and court staff, so the public route is the circuit clerk of the county where the case was filed. Cook County's Clerk of the Circuit Court publishes free civil, criminal, and traffic case searches, while smaller circuits vary from full portals to counter-only access, as described in our guide to finding public records online.