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 on September 23, 2026.
Sangamon County, Illinois, has about 194,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Sangamon County is held at the county jail, run by the Sangamon 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: Sangamon County public records, Sangamon County arrest records, Sangamon County warrants, Sangamon County criminal records, Sangamon County court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Sangamon County
The county jail, run by the Sangamon County Sheriff's Office, holds everyone kept in custody after an arrest in Sangamon County, from every agency.
SearchSystems opened and checked the custody page of the Sangamon County Sheriff's Office at sangamonil.gov/departments/s-z/sheriff/inmate-roster (page title: Inmate Roster), which answered when SearchSystems opened it on September 23, 2026.
Someone booked recently shows on that page; someone cited and released at the scene, or held a few hours at a city station, does not.
The Sangamon County Jail by the Numbers
On an average day in 2023 the jail held about 320 people, down from about 340 in 2019. Its rated capacity in 2023 was 314 beds, and it ran at 103 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Sangamon County has about 194,000 residents (2024 Census Bureau estimate), so the jail holds about 17 people for every 10,000 residents.
Who Books People Into the Sangamon County Jail
The Sangamon County Sheriff's Office and the agencies that report for Springfield, Chatham, Sherman, Auburn, Rochester, Riverton and 12 more cities make the arrests that end in a booking in Sangamon County.
The FBI's agency list also places two other agencies, three campus police departments and one state agency in Sangamon County (the arrest records guide names each one).
The Virden Police Department is listed by the FBI across two counties including Sangamon County, so its arrests are not broken out for Sangamon County here.
The largest arrest counts reported to the FBI were Springfield's 4,367 for 2025, Buffalo's 1,152 for 2025 and the Sangamon County Sheriff's Office's 444 for 2025.
Together, the 12 agencies in Sangamon County with all twelve months of 2025 on file reported 6,162 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 Sangamon 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 Sangamon 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 Sangamon County?
Look on the custody page of the Sangamon County Sheriff's Office at sangamonil.gov. It covers people booked into the county jail.
How many people are in the Sangamon County jail?
About 320 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 314 beds.
Where do people sentenced to prison in Sangamon 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 Sangamon 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.