Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones the agency reported to the FBI, through 2025. 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 September 25, 2026.
O'Fallon, Missouri, in St. Charles County, has about 95,000 residents (2024 Census Bureau estimate), and its arrests are reported to the FBI by an agency of its own. An arrest in the city leaves the same records whoever makes it: the arresting agency's report, the record of anyone held at the county jail, and, if the Prosecuting Attorney files charges, a case in the St. Charles County Circuit Court. This guide says who keeps each one, what it costs and who may see it, with the arrest counts the agency reported.
This guide covers who makes arrests, how many arrests, booking and the jail, finding an arrest, copies and common questions.
Related guides: O'Fallon public records, St. Charles County arrest records, Missouri arrest records and Missouri inmate search.
Who Makes Arrests in O'Fallon
The FBI lists O'Fallon with an arrest reporting agency of its own, filed as O'Fallon Police Department. It reported 1,652 arrests for 2025. A city is listed separately whether the officers are the city's own or the sheriff's under contract; the FBI's list does not say which.
Outside the city, the St. Charles County Sheriff's Office is the county agency. It reported 1,032 arrests for 2025.
The FBI's agency list also places these agencies in St. Charles County: St. Charles Regional Drug Task Force (other); St. Charles Community College (campus police).
How Many Arrests O'Fallon Reports
Each agency reports its arrests to the FBI by month, and the FBI publishes them on the Crime Data Explorer. These are the full-year totals, all offenses, as the FBI held them on October 8, 2026; a year with months missing or not reported is left out.
- O'Fallon: 1,652 for 2025, 1,445 for 2024, 1,695 for 2023, 1,713 for 2022, 2,013 for 2021 and 2,012 for 2020.
O'Fallon's 1,652 arrests in 2025 were up 14 percent from 1,445 in 2024.
Through July 2026, O'Fallon reported 875 arrests, against 993 in the same months of 2025.
Across St. Charles County, the seven agencies with all twelve months of 2025 on file reported 7,625 arrests between them.
Booking: Where People Arrested in O'Fallon Are Held
The county jail is where a person arrested in O'Fallon and kept in custody ends up, whichever agency made the arrest, though a city department may hold someone in its own cells first and a person cited and released at the scene is never booked. The jail's record of each person held, with the charges, is a public record of the arrest, and once the person is released or sentenced the record continues in the court file.
On an average day in 2019 the jail held about 450 people. Its rated capacity in 2019 was 528 beds, and it ran at 84 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
A sentence of more than a year is served in state prison; the Missouri Department of Corrections lists its inmates at web.mo.gov/doc/offSearchWeb.
How to Find Out About an Arrest in O'Fallon
Whether someone was arrested in O'Fallon, and what came of it, shows up in two places: the case index of the St. Charles County Circuit Court, kept by the Circuit Clerk, which shows whether charges were filed and the next court date; the Prosecuting Attorney, which decides whether an arrest becomes a charge (its page is at stcharlescitymo.gov/839/Prosecuting-Attorney, phone (636) 940-4636).
The court records page SearchSystems verified for the county, at stcharlescitymo.gov/176/Municipal-Courts (page title: Municipal Court | St. Charles, MO), phone (636) 949-3378, belongs to a lower court, not to the St. Charles County Circuit Court.
Statewide, Case.net is the Missouri courts' free statewide case search.
Missouri is one of the states that lets anyone look up another person's statewide criminal history: the open record search on the MACHS site lets anyone check convictions by name, through the Missouri State Highway Patrol Criminal Justice Information Services Division. That record shows what agencies reported to the state, which is wider than one county's court index but can lag it.
Getting a Copy of an Arrest Record in O'Fallon
The report of an arrest is released by the agency that made it; the jail and the court hold their own records of the same event, but not the report. Under the Missouri Sunshine Law the agency must answer within 3 business days, and it may charge research time and copying.
- An arrest by the O'Fallon police: the police records page SearchSystems verified at ofallonmo.gov/departments/police/observant_professional_dedicated/s... (page title: City of O'Fallon, MO), phone 636-379-5678, 2650 Tri Sports Circle O'Fallon, MO 63368, which answered when SearchSystems opened it on September 25, 2026.
- An arrest by the St. Charles County Sheriff's Office: ask its records unit.
- A defendant who has been charged gets the report through the case: the Prosecuting Attorney, (636) 940-4636, handles discovery for pending cases.
- The court file of a case that was filed: in the St. Charles County Circuit Court it is kept by the Circuit Clerk. The court records page SearchSystems verified for the county, at stcharlescitymo.gov/176/Municipal-Courts, phone (636) 949-3378, is a lower court's.
- Your own statewide record: the same request described above, for your own name.
The St. Charles County guide covers every agency in the county: St. Charles County arrest records.
Frequently Asked Questions
How many arrests are made in O'Fallon each year?
O'Fallon reported 1,652 arrests to the FBI for 2025, its latest full year.
Where are people arrested in O'Fallon booked?
Those kept in custody go to the county jail, run by the St. Charles County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in O'Fallon?
The court files of criminal cases are public, and so is the statewide criminal history kept by the Missouri State Highway Patrol Criminal Justice Information Services Division: the open record search on the MACHS site lets anyone check convictions by name. The arrest report itself is released by the agency that made the arrest, under the Missouri Sunshine Law.
How do I get a copy of an arrest report in O'Fallon?
From the agency that made the arrest: the O'Fallon police for its own arrests, the St. Charles County Sheriff's Office for the sheriff's. Under the Missouri Sunshine Law the answer is due within 3 business days.
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.