Reviewed and updated October 11, 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 11, 2026.
St. Charles County, Missouri, has about 424,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in St. Charles County is held at the county jail, run by the St. Charles County Sheriff's Office, and the jail's record of each person held is a public record. This guide says where to look for someone in custody, what the jail holds and who books people into it.
This guide covers the search, the jail, who books people, state prison and common questions.
Related guides: St. Charles County public records, St. Charles County arrest records, St. Charles County warrants, St. Charles County criminal records, St. Charles County court records, Missouri arrest records and Missouri inmate search.
Finding Someone in Custody in St. Charles County
A person kept in custody after an arrest in St. Charles County is held at the county jail, run by the St. Charles County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the St. Charles County Sheriff's Office at sccmo.org/183/Corrections (page title: Corrections | St Charles County, MO), phone 636-949-3003, 9506 Olive Blvd. MB# 213 Olivette, MO 63132, Monday - Friday 8 a.m. - 5 p.m., which answered when SearchSystems opened it on October 11, 2026.
That page is the office's jail information page rather than a roster, so a search for a particular person goes through the office at 636-949-3003.
The St. Charles County Jail by the Numbers
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.
St. Charles County has about 424,000 residents (2024 Census Bureau estimate), so the jail holds about 11 people for every 10,000 residents.
Who Books People Into the St. Charles County Jail
The St. Charles County Sheriff's Office, the St. Charles County Police Department and the agencies that report for O'Fallon, St. Charles, St. Peters, Wentzville, Lake St. Louis, Cottleville and one more cities make the arrests that end in a booking in St. Charles County.
The FBI's agency list also places these agencies in St. Charles County: St. Charles Regional Drug Task Force (other agency); St. Charles Community College (campus police).
The largest arrest counts reported to the FBI were St. Charles's 2,309 for 2025, O'Fallon's 1,652 for 2025 and Wentzville's 1,119 for 2025.
Together, the seven agencies in St. Charles County with all twelve months of 2025 on file reported 7,625 arrests to the FBI that year. Those kept in custody were booked into the county jail; a person cited and released at the scene was not.
The counts, agency by agency and year by year, are in St. Charles County arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Missouri Department of Corrections lists its inmates at web.mo.gov/doc/offSearchWeb.
Frequently Asked Questions
How do I find an inmate in St. Charles County?
Ask the St. Charles County Sheriff's Office at 636-949-3003; its jail page SearchSystems verified is at sccmo.org/183/Corrections.
How many people are in the St. Charles County jail?
About 450 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 528 beds.
What is the phone number for the St. Charles County jail?
636-949-3003, the number on the page of the St. Charles County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in St. Charles County go?
To a facility of the Missouri Department of Corrections; its inmate locator is at web.mo.gov/doc/offSearchWeb.
Is this the official St. Charles 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.