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 September 25, 2026.
Collinsville, Illinois, in Madison County, has about 24,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Collinsville is held at the county jail, run by the Madison 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: Collinsville public records, Madison County inmate search, Collinsville arrest records, Collinsville warrants, Collinsville criminal records, Collinsville court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Collinsville
A person kept in custody after an arrest in Collinsville is held at the county jail, run by the Madison County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Madison County Sheriff's Office at sheriffrandytucker.com/madison-county-detention-center (page title: Madison County Detention Center | Madison County Sheriff's Department), which answered when SearchSystems opened it on September 23, 2026.
That page is the office's jail information page rather than a roster.
The Madison County Jail by the Numbers
On an average day in 2023 the jail held about 240 people, down from about 310 in 2019. Its rated capacity in 2023 was 306 beds, and it ran at 80 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Madison County has about 263,000 residents (2024 Census Bureau estimate), so the jail holds about 9 people for every 10,000 residents.
Who Books People Into the Madison County Jail
The Madison County Sheriff's Office and the agency that reports for Collinsville (filed by the FBI as Collinsville Police Department) make the arrests that end in a booking in and around Collinsville.
The FBI's agency list also places these agencies in Madison County: Norfolk Southern Railway in Madison County and Terminal Railroad Association (other agency); Southern Illinois University at Edwardsville (campus police).
The Pierron Police Department and the Fairmont City Police Department are each listed by the FBI across several counties including Madison County, so their arrests are not broken out for Madison County here.
The largest arrest counts reported to the FBI were St. Jacob's 1,152 for 2025, Venice's 1,152 for 2025 and Madison's 1,152 for 2025.
Together, the 20 agencies in Madison County with all twelve months of 2025 on file reported 8,317 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 Collinsville 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 Madison 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 Collinsville?
Ask the Madison County Sheriff's Office; its jail page SearchSystems verified is at sheriffrandytucker.com.
How many people are in the Madison County jail?
About 240 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 306 beds.
Where do people sentenced to prison in Madison 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 Collinsville 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.