Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest and crime 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.
Marion, Illinois, in Williamson County, has about 17,000 residents (2024 Census Bureau estimate). In Illinois the public criminal record is the court file, kept by the Circuit Clerk; the statewide criminal history kept by the Illinois State Police is open to anyone who asks. This guide says where each record of a criminal case from Marion is kept and how it is seen.
This guide covers the court file, the statewide record, local arrest records, the crimes behind the records, the prosecutor, sex offender registry, records requests and common questions.
Related guides: Marion public records, Williamson County criminal records, Marion arrest records, Marion warrants, Marion inmate search, Marion court records, Illinois arrest records and Illinois inmate search.
Criminal Cases in the Circuit Court of Williamson County
A criminal case from Marion is filed in the Circuit Court of Williamson County, and the court file, kept by the Circuit Clerk, is the record of it that the public may see.
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 Criminal History and Your Own Copy
Illinois is one of the states that lets anyone look up another person's statewide criminal history: conviction information is public under the Uniform Conviction Information Act, through the Illinois State Police. The result is the repository record, what agencies reported to the state, which is wider than one county's court index but can lag it.
To see your own record, the route is a name-based or fingerprint-based request to the Illinois State Police. The state page SearchSystems verified for it is at isp.illinois.gov/BureauOfIdentification/MyRecord.
Arrest Records Kept Locally in Marion
The Williamson County Sheriff's Office and the agency that reports for Marion (filed by the FBI as Marion Police Department) keep the arrest records in and around Marion: the report and the booking record of each arrest stay with the agency that made it, separate from the court file and from the state repository.
The FBI's agency list also places one more agency in Williamson County: John A. Logan College (campus police); it keeps the records of its own arrests.
Together, the five agencies in Williamson County with all twelve months of 2025 on file reported 2,793 arrests to the FBI that year; how each case ended is in the court file, not in the arresting agency's.
The agencies and their counts, year by year, are in Marion arrest records.
The Crimes Behind the Records: Marion in 2025
The agency that reports for Marion had 72 violent and 441 property crimes reported for 2025; each one is a report on file with it, and each arrest that follows is the start of a criminal record.
The State's Attorney for Williamson County
The State's Attorney decides which arrests in Williamson County become charges and files them in the Circuit Court of Williamson County; the office answers questions about pending prosecutions, and the case files themselves are court records.
The office'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 Sex Offender Registry for Marion
Registered sex offenders living in Marion are listed on the Illinois Sex Offender Registry, run by the Illinois State Police at illinois.gov. The registry is public and can be searched online.
Registration itself is done in person with the local agency where the registrant lives: the sheriff's office, or the city police in a city with its own department.
Asking an Agency in Williamson County for a Record
An arrest report, a booking record or a local criminal history letter comes from the agency that holds it, not from the court.
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
Are criminal records public in Marion?
The court files of criminal cases are public, and so is the statewide criminal history kept by the Illinois State Police: conviction information is public under the Uniform Conviction Information Act. The arrest report itself is released by the agency that made the arrest, under the Illinois Freedom of Information Act.
Can I search Marion criminal cases online?
The court records page SearchSystems verified for the county is at williamsoncountyil.gov (page title: Circuit Clerk | Williamson County).
How do I get my own Illinois criminal history?
Through a name-based or fingerprint-based request to the Illinois State Police.
Who prosecutes crimes in Marion?
The State's Attorney, reached at (618) 998-2229, which files its cases in the Circuit Court of Williamson County.
Is this the official Marion 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.