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 30, 2026.
Ann Arbor, Michigan, in Washtenaw County, has about 123,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Ann Arbor is held at the county jail, run by the Washtenaw 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: Ann Arbor public records, Washtenaw County inmate search, Ann Arbor arrest records, Ann Arbor warrants, Ann Arbor criminal records, Ann Arbor court records, Michigan arrest records and Michigan inmate search.
Finding Someone in Custody in Ann Arbor
A person kept in custody after an arrest in Ann Arbor is held at the county jail, run by the Washtenaw County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Washtenaw County Sheriff's Office at washtenaw.org/sheriff (page title: Sheriff | Washtenaw County, MI), which answered when SearchSystems opened it on September 23, 2026.
That page is the office's jail information page rather than a roster.
The Washtenaw County Jail by the Numbers
On an average day in 2023 the jail held about 320 people, down from about 380 in 2019. Its rated capacity in 2023 was 407 beds, and it ran at 78 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Washtenaw County has about 374,000 residents (2024 Census Bureau estimate), so the jail holds about 9 people for every 10,000 residents.
Who Books People Into the Washtenaw County Jail
The Washtenaw County Sheriff's Office and the agency that reports for Ann Arbor (filed by the FBI as Ann Arbor Police Department) make the arrests that end in a booking in and around Ann Arbor.
The FBI's agency list also places one other agency, three campus police departments and one state police unit in Washtenaw County (the arrest records guide names each one).
The largest arrest counts reported to the FBI were Ann Arbor's 1,263 for 2025, the Washtenaw County Sheriff's Office's 1,014 for 2025 and Pittsfield Township's 588 for 2025.
Together, the eight agencies in Washtenaw County with all twelve months of 2025 on file reported 3,408 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 Ann Arbor arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Michigan Department of Corrections lists its inmates at mdocweb.state.mi.us/otis2.
Frequently Asked Questions
How do I find an inmate in Ann Arbor?
Ask the Washtenaw County Sheriff's Office; its jail page SearchSystems verified is at washtenaw.org/sheriff.
How many people are in the Washtenaw 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 407 beds.
Where do people sentenced to prison in Washtenaw County go?
To a facility of the Michigan Department of Corrections; its inmate locator is at mdocweb.state.mi.us/otis2.
Is this the official Ann Arbor 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.