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.
Shiloh, Illinois, in St. Clair County, has about 15,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Shiloh is held at the county jail, run by the St. Clair 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: Shiloh public records, St. Clair County inmate search, Shiloh arrest records, Shiloh warrants, Shiloh police reports, Shiloh property records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Shiloh
The county jail, run by the St. Clair County Sheriff's Office, holds everyone kept in custody after an arrest in Shiloh, from every agency.
SearchSystems opened and checked the jail page of the St. Clair County Sheriff's Office at co.st-clair.il.us/departments/sheriffs-department (page title: Sheriff's Department | Departments | St. Clair), phone (618) 277-3505, which answered when SearchSystems opened it on October 4, 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 (618) 277-3505.
The St. Clair County Jail by the Numbers
On an average day in 2021 the jail held about 450 people, up from about 350 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 418 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. Clair County has about 251,000 residents (2024 Census Bureau estimate), so the jail holds about 18 people for every 10,000 residents.
Who Books People Into the St. Clair County Jail
The St. Clair County Sheriff's Office and the agency that reports for Shiloh (filed by the FBI as Shiloh Police Department) make the arrests that end in a booking in and around Shiloh.
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).
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.
The largest arrest counts reported to the FBI were East Carondelet's 1,152 for 2025, Cahokia Heights's 1,152 for 2025 and Fairview Heights's 1,028 for 2025.
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. 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 Shiloh 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 St. Clair 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 Shiloh?
Ask the St. Clair County Sheriff's Office at (618) 277-3505; its jail page SearchSystems verified is at co.st-clair.il.us.
How many people are in the St. Clair County jail?
About 450 on an average day in 2021, the latest year in the Vera Institute's jail data, against a rated capacity of 418 beds.
What is the phone number for the St. Clair County jail?
(618) 277-3505, the number on the page of the St. Clair County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in St. Clair 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 Shiloh 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.