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.
Allegan County, Michigan, has about 122,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Allegan County is held at the county jail, run by the Allegan 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: Allegan County public records, Allegan County arrest records, Allegan County warrants, Allegan County criminal records, Allegan County court records, Michigan arrest records and Michigan inmate search.
Finding Someone in Custody in Allegan County
The county jail, run by the Allegan County Sheriff's Office, holds everyone kept in custody after an arrest in Allegan County, from every agency.
SearchSystems opened and checked the custody page of the Allegan County Sheriff's Office at allegancounty.org/courts-law-enforcement/sheriff-s-office-correctio... (page title: Inmate Lookup | Allegan County, MI), phone (269) 673-0500, 640 River St. Allegan, MI 49010, 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 Allegan County Jail by the Numbers
On an average day in 2023 the jail held about 130 people, down from about 260 in 2019. Its rated capacity in 2023 was 225 beds, and it ran at 60 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Allegan County has about 122,000 residents (2024 Census Bureau estimate), so the jail holds about 11 people for every 10,000 residents.
Who Books People Into the Allegan County Jail
The Allegan County Sheriff's Office and the agencies that report for Allegan, Wayland, Otsego, Plainwell and Saugatuck make the arrests that end in a booking in Allegan County.
The FBI's agency list also places one more agency in Allegan County: the Allegan County State Police (state police).
The Holland Police Department and the South Haven Police Department are each listed by the FBI across several counties including Allegan County, so their arrests are not broken out for Allegan County here.
The largest arrest counts reported to the FBI were the Allegan County Sheriff's Office's 2,349 for 2025, Otsego's 179 for 2019 and Allegan's 97 for 2025.
Together, the four agencies in Allegan County with all twelve months of 2025 on file reported 2,553 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 Allegan 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 Allegan County serves the sentence in a facility of the Michigan Department of Corrections, whose inmate locator is at mdocweb.state.mi.us/otis2.
Frequently Asked Questions
How do I find an inmate in Allegan County?
Look on the custody page of the Allegan County Sheriff's Office at allegancounty.org, or call (269) 673-0500. It covers people booked into the county jail.
How many people are in the Allegan County jail?
About 130 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 225 beds.
What is the phone number for the Allegan County jail?
(269) 673-0500, the number on the page of the Allegan County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Allegan 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 Allegan 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.