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 28, 2026.
Carroll County, Illinois, has about 15,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Carroll County is held at the county jail, run by the Carroll 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: Carroll County public records, Carroll County arrest records, Carroll County warrants, Carroll County criminal records, Carroll County court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Carroll County
A person kept in custody after an arrest in Carroll County is held at the county jail, run by the Carroll County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Carroll County Sheriff's Office at carrollcountyil.gov/county_departments/sheriff/index.php (page title: Carroll County, IL), phone 815-244-2635, which answered when SearchSystems opened it on September 28, 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 815-244-2635.
The Carroll County Jail by the Numbers
On an average day in 2019 the jail held about 17 people. Its rated capacity in 2019 was 26 beds, and it ran at 65 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Carroll County has about 15,000 residents (2024 Census Bureau estimate), so the jail holds about 11 people for every 10,000 residents.
Who Books People Into the Carroll County Jail
The Carroll County Sheriff's Office and the agencies that report for Savanna, Thomson, Lanark, Mount Carroll, Milledgeville, Shannon and one more cities make the arrests that end in a booking in Carroll County.
The largest arrest counts reported to the FBI were Chadwick's 1,152 for 2025, Thomson's 1,152 for 2025 and the Carroll County Sheriff's Office's 116 for 2025.
Together, the six agencies in Carroll County with all twelve months of 2025 on file reported 2,427 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 Carroll County 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 Carroll 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 Carroll County?
Ask the Carroll County Sheriff's Office at 815-244-2635; its jail page SearchSystems verified is at carrollcountyil.gov.
How many people are in the Carroll County jail?
About 17 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 26 beds.
What is the phone number for the Carroll County jail?
815-244-2635, the number on the page of the Carroll County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Carroll 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 Carroll 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.