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. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 23, 2026 and October 4, 2026.
O'Fallon, Illinois, in St. Clair County, has about 32,000 residents (2024 Census Bureau estimate). Every warrant for O'Fallon comes from a judge of the Circuit Court of St. Clair County, is served by whichever agency finds the person, and is recorded in the court file of the case it was issued in. This guide says who issues and serves warrants here, where a person arrested on one is held, how to check for one and how one is cleared.
This guide covers who issues warrants, who serves warrants, after a warrant arrest, checking for a warrant, clearing a warrant and common questions.
Related guides: O'Fallon public records, St. Clair County warrants, O'Fallon arrest records, O'Fallon inmate search, O'Fallon property records, Illinois arrest records and Illinois inmate search.
Who Issues Warrants in O'Fallon
In Illinois an arrest warrant is signed by a judge. For O'Fallon that means the Circuit Court of St. Clair County, which hears every civil, criminal, family, probate, traffic and juvenile case.
When a defendant misses a court date the judge issues a bench warrant, and either kind of warrant lives in the court file of the case, kept by the Circuit Clerk.
Illinois has no single public index of every trial court case; each court's records are looked up through that court.
Who Serves Warrants in O'Fallon
The St. Clair County Sheriff's Office and the agency that reports for O'Fallon (filed by the FBI as O'Fallon Police Department) serve warrants in and around O'Fallon.
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 serves warrants on its own ground.
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.
A warrant issued in St. Clair County is good anywhere in Illinois, so it is served by whichever agency finds the person, in a traffic stop as often as at the door.
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; arrests on warrants are counted among them, not separately.
Each agency and what it reported is in O'Fallon arrest records.
Where a Person Arrested on a Warrant from O'Fallon Is Held
A person arrested on a warrant and kept in custody goes to the county jail, whichever agency made the arrest. The jail, run by the St. Clair County Sheriff's Office, held about 450 people on an average day in 2021 by the Vera Institute of Justice's count and has a jail page SearchSystems verified at co.st-clair.il.us/departments/sheriffs-department, phone (618) 277-3505. The O'Fallon inmate search guide covers the jail in full.
A person arrested in O'Fallon on a warrant from another county is held at the same jail until that county takes custody.
How to Check for a Warrant in O'Fallon
The place to check for a warrant from O'Fallon is the State's Attorney, phone (618) 277-3892, which can say whether charges were filed; a warrant on a complaint follows the filing.
Not one of the St. Clair County pages SearchSystems verified (the sheriff's, the prosecutor's and the records request page) is a list of open warrants, so a check means asking the court or the prosecutor about a case by name.
Clearing a Warrant from O'Fallon
A warrant is recalled by the court that issued it, so clearing one from O'Fallon starts with the Circuit Clerk: the case goes back on the calendar and the judge recalls the warrant when the person appears.
A lawyer can often arrange the appearance in advance. The State's Attorney's page SearchSystems verified is at co.st-clair.il.us/departments/states-attorney, phone (618) 277-3892.
Frequently Asked Questions
Can I check for a warrant online in O'Fallon?
Not from the St. Clair County pages SearchSystems verified; none of them is a warrant list. The court that issued it keeps the record; ask the Circuit Clerk.
Who serves warrants in O'Fallon?
The agency that reports for O'Fallon inside the city and the St. Clair County Sheriff's Office outside it, or whichever agency finds the person; an Illinois warrant is valid anywhere in the state.
Where is a person arrested on a warrant in O'Fallon held?
At the county jail, run by the St. Clair County Sheriff's Office, if kept in custody.
How is a warrant from O'Fallon cleared?
By appearing before the court that issued it; the judge recalls the warrant in court. The case is put back on the calendar through the Circuit Clerk.
Is this the official O'Fallon 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.