Reviewed and updated October 11, 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 11, 2026.
St. Clair County, Illinois, has about 251,000 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 St. Clair County 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: St. Clair County public records, St. Clair County arrest records, St. Clair County warrants, St. Clair County inmate search, St. Clair County court records, Illinois arrest records and Illinois inmate search.
Criminal Cases in the Circuit Court of St. Clair County
A criminal case from St. Clair County is filed in the Circuit Court of St. Clair County, and the court file, kept by the Circuit Clerk, is the record of it that the public may see.
For St. Clair County, SearchSystems opened and checked the court records page for the county at co.st-clair.il.us/WebDocuments/Departments/CircuitClerk/AttorneyRes... (page title: RULES OF PRACTICE CIRCUIT COURT OF ILLINOIS TWENTIETH JUDICIAL COURT), which answered when SearchSystems opened it on October 11, 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 St. Clair County
The St. Clair County Sheriff's Office and the agencies that report for Belleville, O'Fallon, East St. Louis, Cahokia Heights, Fairview Heights, Shiloh and 16 more cities keep the arrest records in St. Clair County: 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 these agencies in St. Clair County: Alton and Southern Railway and Union Pacific Railroad in St. Clair County (other agency); Southwestern Illinois College (campus police); each keeps the records of its own arrests.
The Columbia Police Department, the New Baden Police Department, the Collinsville Police Department and one more are each listed by the FBI across several counties including St. Clair County, so their arrests are not broken out for St. Clair County here.
Together, the 17 agencies in St. Clair County with all twelve months of 2025 on file reported 6,114 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 St. Clair County arrest records.
The Crimes Behind the Records: St. Clair County in 2025
The 15 agencies in St. Clair County with all twelve months of 2025 on file reported 498 violent and 2,113 property crimes to the FBI that year; the same agencies with both 2025 and 2024 complete reported 2,611 crimes in 2025 against 2,777 in 2024. Each reported crime is a report on file with the agency that took it, and each arrest that follows is the start of a criminal record.
The full crime section, agency by agency, is on the St. Clair County public records guide.
The State's Attorney for St. Clair County
Charges in St. Clair County are filed by the State's Attorney, which reviews the arrests of every agency in the county and brings the cases in the Circuit Court of St. Clair County.
The office's page SearchSystems verified is at co.st-clair.il.us/departments/states-attorney (page title: State's Attorney | Departments | St. Clair), phone (618) 277-3892, 10 Public Square Belleville, IL 62220, which answered when SearchSystems opened it on September 23, 2026.
The Sex Offender Registry for St. Clair County
Registered sex offenders living in St. Clair County 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 St. Clair 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. The county records request page SearchSystems verified is at stclaircountyil.justfoia.com/publicportal/home/newrequest (page title: St. Clair County, IL Public Portal | JustFOIA).
Frequently Asked Questions
Are criminal records public in St. Clair County?
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 St. Clair County criminal cases online?
The court records page SearchSystems verified for the county is at co.st-clair.il.us (page title: RULES OF PRACTICE CIRCUIT COURT OF ILLINOIS TWENTIETH JUDICIAL COURT).
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 St. Clair County?
The State's Attorney, reached at (618) 277-3892, which files its cases in the Circuit Court of St. Clair County.
Is this the official St. Clair 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.