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 1, 2026.
Alger County, Michigan, has about 8,700 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Alger County is held at the county jail, run by the Alger 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: Alger County public records, Alger County arrest records, Alger County warrants, Alger County criminal records, Alger County court records, Michigan arrest records and Michigan inmate search.
Finding Someone in Custody in Alger County
A person kept in custody after an arrest in Alger County is held at the county jail, run by the Alger County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Alger County Sheriff's Office at algercounty.gov/departments/sheriff (page title: Sheriff | Alger County), phone (906) 387-4444, which answered when SearchSystems opened it on September 23, 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 (906) 387-4444.
The Alger County Jail by the Numbers
On an average day in 2020 the jail held about 26 people, down from about 35 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 50 beds, and it ran at 70 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Alger County has about 8,700 residents (2024 Census Bureau estimate), so the jail holds about 29 people for every 10,000 residents.
Who Books People Into the Alger County Jail
The Alger County Sheriff's Office and the agency that reports for Munising make the arrests that end in a booking in Alger County.
The FBI's agency list also places one more agency in Alger County: the Alger County State Police (state police).
The largest arrest counts reported to the FBI were the Alger County Sheriff's Office's 39 for 2025 and Munising's 31 for 2025.
Together, the two agencies in Alger County with all twelve months of 2025 on file reported 70 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 Alger 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 Alger 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 Alger County?
Ask the Alger County Sheriff's Office at (906) 387-4444; its jail page SearchSystems verified is at algercounty.gov/departments/sheriff.
How many people are in the Alger County jail?
About 26 on an average day in 2020, the latest year in the Vera Institute's jail data, against a rated capacity of 50 beds.
What is the phone number for the Alger County jail?
(906) 387-4444, the number on the page of the Alger County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Alger 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 Alger 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.