Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. Every office link was opened and checked against the office's own site between September 23, 2026 and October 4, 2026.
Williamson County, Illinois, has about 67,000 residents (2024 Census Bureau estimate). Its court cases are filed in the Circuit Court of Williamson County, and the file of each case, kept by the Circuit Clerk, is the public record of it. This guide says which court hears what, where to look a case up and who keeps the files.
This guide covers the courts, the records page, criminal cases, kinds of files, cities and common questions.
Related guides: Williamson County public records, Williamson County arrest records, Williamson County warrants, Williamson County inmate search, Williamson County criminal records, Illinois arrest records and Illinois inmate search.
The Courts That Hear Cases from Williamson County
In Williamson County, the Circuit Court of Williamson County hears every civil, criminal, family, probate, traffic and juvenile case.
Divorces go to the Circuit Court's domestic relations division, and the file stays with the Circuit Clerk.
The Circuit Clerk keeps the files, and a copy of anything in a file comes from that office, under the court's own rules rather than the Illinois Freedom of Information Act.
Looking Up a Case from Williamson County
The court records page SearchSystems verified for the county is at williamsoncountyil.gov/departments/circuit-clerk (page title: Circuit Clerk | Williamson County), phone (618) 997-1301, Monday-Friday 8:00 a.m. - 4:00 p.m., which answered when SearchSystems opened it on September 23, 2026.
Illinois has no single public index of every trial court case; each court's records are looked up through that court.
The Illinois court page SearchSystems verified is at illinoiscourts.gov.
What Reaches the Court from Williamson County
Together, the five agencies in Williamson County with all twelve months of 2025 on file reported 2,793 arrests to the FBI that year; the State's Attorney decides which of those arrests become cases in the Circuit Court of Williamson County.
The State's Attorney's page SearchSystems verified is at williamsoncountyil.gov/states-attorney (page title: State's Attorney | Williamson County), phone (618) 998-2229, which answered when SearchSystems opened it on September 23, 2026.
The Kinds of Court Files
The court file is one record with several readers: a criminal case from the arrest to the sentence, a divorce from the petition to the judgment, a traffic ticket from the citation to the conviction the court reports to the Illinois Secretary of State, and an eviction or a lien on land.
The other Williamson County guides take the kinds of file one at a time: Williamson County criminal records, Williamson County divorce records, Williamson County traffic tickets, Williamson County DUI and Williamson County property records.
Cities in Williamson County
Wherever in the county a case arises, it is filed in the Circuit Court of Williamson County.
SearchSystems has a guide to the offices of these cities in Williamson County, with the 2024 Census Bureau population; a city with its own court records guide opens there:
Frequently Asked Questions
How do I look up a court case in Williamson County?
The court records page SearchSystems verified for the county is at williamsoncountyil.gov, phone (618) 997-1301.
Which court hears felonies in Williamson County?
The Circuit Court of Williamson County, which hears every civil, criminal, family, probate, traffic and juvenile case.
Who keeps the court records in Williamson County?
The Circuit Clerk. Copies come from that office under the court's own rules.
Is there a statewide court case search in Illinois?
No. Each court's records are looked up through that court.
Is this the official Williamson 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.