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.
St. Charles, Illinois, in Kane County, has about 33,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in St. Charles is held at the county jail, run by the Kane 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 public records, Kane County inmate search, St. Charles arrest records, St. Charles warrants, St. Charles criminal records, St. Charles court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in St. Charles
The county jail, run by the Kane County Sheriff's Office, holds everyone kept in custody after an arrest in St. Charles, from every agency.
SearchSystems opened and checked the custody page of the Kane County Sheriff's Office at kanesheriff.com/Pages/Detainee-Search.aspx (page title: Detainee Search), phone 630-232-6840, which answered when SearchSystems opened it on October 4, 2026.
That page is the place to look for someone booked recently. A person cited and released at the scene, or held only a few hours by a city department, will not be on it.
The Kane County Jail by the Numbers
On an average day in 2023 the jail held about 340 people, down from about 510 in 2019. Its rated capacity in 2023 was 640 beds, and it ran at 53 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Kane County has about 521,000 residents (2024 Census Bureau estimate), so the jail holds about 7 people for every 10,000 residents.
Who Books People Into the Kane County Jail
The Kane County Sheriff's Office and the agency that reports for St. Charles (filed by the FBI as St. Charles Police Department) make the arrests that end in a booking in and around St. Charles.
The FBI's agency list also places three campus police departments and two other agencies in Kane County (the arrest records guide names each one).
The Wayne Police Department, the Montgomery Police Department, the Huntley Police Department and three more are each listed by the FBI across several counties including Kane County, so their arrests are not broken out for Kane County here.
The largest arrest counts reported to the FBI were Aurora's 3,132 for 2025, Elgin's 2,162 for 2025 and the Kane County Sheriff's Office's 940 for 2025.
Together, the 19 agencies in Kane County with all twelve months of 2025 on file reported 9,151 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 arrest records.
From the Jail to State Prison
The jail holds people awaiting trial and people serving short sentences. A person sentenced to prison in Kane County serves the sentence in a facility of the Illinois Department of Corrections, whose inmate locator is at idoc.illinois.gov/offender/inmatesearch.html.
Frequently Asked Questions
How do I find an inmate in St. Charles?
Look on the custody page of the Kane County Sheriff's Office at kanesheriff.com/Pages/Detainee-Search.aspx, or call 630-232-6840. It covers people booked into the county jail.
How many people are in the Kane County jail?
About 340 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 640 beds.
What is the phone number for the Kane County jail?
630-232-6840, the number on the page of the Kane County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Kane County go?
To a facility of the Illinois Department of Corrections; its inmate locator is at idoc.illinois.gov/offender/inmatesearch.html.
Is this the official St. Charles 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.