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.
Marquette County, Wisconsin, has about 16,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Marquette County is held at the county jail, run by the Marquette 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: Marquette County public records, Marquette County arrest records, Marquette County warrants, Marquette County police reports, Marquette County property records, Wisconsin arrest records and Wisconsin inmate search.
Finding Someone in Custody in Marquette County
The county jail, run by the Marquette County Sheriff's Office, holds everyone kept in custody after an arrest in Marquette County, from every agency.
SearchSystems opened and checked the jail page of the Marquette County Sheriff's Office at marquettecountywi.gov/sheriff (page title: Sheriff | Marquette County Wisconsin), phone 608-297-2115, 67 W. Park Street PO Box 630 Montello, WI 53949, 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 608-297-2115.
The Marquette County Jail by the Numbers
On an average day in 2025 the jail held about 30 people, up from about 25 in 2019. Its rated capacity in 2025 was 60 beds, and it ran at 49 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Marquette County has about 16,000 residents (2024 Census Bureau estimate), so the jail holds about 19 people for every 10,000 residents.
Who Books People Into the Marquette County Jail
The Marquette County Sheriff's Office and the agencies that report for Montello, Westfield, Oxford, Endeavor and Neshkoro make the arrests that end in a booking in Marquette County.
The largest arrest counts reported to the FBI were the Marquette County Sheriff's Office's 288 for 2025, Montello's 37 for 2025 and Oxford's 19 for 2023.
Together, the four agencies in Marquette County with all twelve months of 2023 on file reported 374 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 Marquette 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 Marquette 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 Marquette County?
Ask the Marquette County Sheriff's Office at 608-297-2115; its jail page SearchSystems verified is at marquettecountywi.gov/sheriff.
How many people are in the Marquette County jail?
About 30 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 60 beds.
What is the phone number for the Marquette County jail?
608-297-2115, the number on the page of the Marquette County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Marquette 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 Marquette 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.