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 24, 2026.
Marinette County, Wisconsin, has about 42,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Marinette County is held at the county jail, run by the Marinette 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: Marinette County public records, Marinette County arrest records, Marinette County warrants, Marinette County criminal records, Marinette County court records, Wisconsin arrest records and Wisconsin inmate search.
Finding Someone in Custody in Marinette County
A person kept in custody after an arrest in Marinette County is held at the county jail, run by the Marinette County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Marinette County Sheriff's Office at marinettecountywi.gov/departments/office-of-sheriff/jail (page title: Marinette County | Departments | Office of Sheriff | Jail), phone 888-868-4631, 2161 University Drive Marinette, WI 54143, Monday thru Friday 8:00 AM - 4:30 PM, 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 888-868-4631.
The Marinette County Jail by the Numbers
On an average day in 2025 the jail held about 130 people, up from about 110 in 2019. Its rated capacity in 2025 was 165 beds, and it ran at 79 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Marinette County has about 42,000 residents (2024 Census Bureau estimate), so the jail holds about 31 people for every 10,000 residents.
Who Books People Into the Marinette County Jail
The Marinette County Sheriff's Office and the agencies that report for Marinette, Peshtigo, Niagara, Crivitz and Coleman make the arrests that end in a booking in Marinette County.
The largest arrest counts reported to the FBI were the Marinette County Sheriff's Office's 917 for 2025, Marinette's 762 for 2025 and Peshtigo's 115 for 2025.
Together, the four agencies in Marinette County with all twelve months of 2025 on file reported 1,853 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 Marinette 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 Marinette County serves the sentence in a facility of the Wisconsin Department of Corrections, whose inmate locator is at appsdoc.wi.gov/lop/welcome.
Frequently Asked Questions
How do I find an inmate in Marinette County?
Ask the Marinette County Sheriff's Office at 888-868-4631; its jail page SearchSystems verified is at marinettecountywi.gov.
How many people are in the Marinette County jail?
About 130 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 165 beds.
What is the phone number for the Marinette County jail?
888-868-4631, the number on the page of the Marinette County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Marinette County go?
To a facility of the Wisconsin Department of Corrections; its inmate locator is at appsdoc.wi.gov/lop/welcome.
Is this the official Marinette 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.