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.
Ripon, Wisconsin, in Fond du Lac County, has about 7,700 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Ripon is held at the county jail, run by the Fond du Lac 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: Ripon public records, Fond du Lac County inmate search, Ripon arrest records, Ripon warrants, Ripon criminal records, Ripon court records, Wisconsin arrest records and Wisconsin inmate search.
Finding Someone in Custody in Ripon
The county jail, run by the Fond du Lac County Sheriff's Office, holds everyone kept in custody after an arrest in Ripon, from every agency.
SearchSystems opened and checked the jail page of the Fond du Lac County Sheriff's Office at fdlsheriff.com/jail/jail-information (page title: Jail Information | Fond du Lac County), phone (920) 929-3394, 63 Western Avenue Fond du Lac, WI 54935, Monday through Friday 8:00 a.m. - 4:30 p.m., which answered when SearchSystems opened it on September 28, 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 (920) 929-3394.
The Fond du Lac County Jail by the Numbers
On an average day in 2025 the jail held about 270 people, down from about 270 in 2019. Its rated capacity in 2025 was 335 beds, and it ran at 81 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Fond du Lac County has about 104,000 residents (2024 Census Bureau estimate), so the jail holds about 26 people for every 10,000 residents.
Who Books People Into the Fond du Lac County Jail
The Fond du Lac County Sheriff's Office and the agency that reports for Ripon (filed by the FBI as Ripon Police Department) make the arrests that end in a booking in and around Ripon.
The Waupun Police Department is listed by the FBI across two counties including Fond du Lac County, so its arrests are not broken out for Fond du Lac County here.
The largest arrest counts reported to the FBI were Fond du Lac's 3,718 for 2025, the Fond du Lac County Sheriff's Office's 1,471 for 2025 and North Fond du Lac's 375 for 2025.
Together, the four agencies in Fond du Lac County with all twelve months of 2025 on file reported 5,906 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 Ripon arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Wisconsin Department of Corrections lists its inmates at appsdoc.wi.gov/lop/welcome.
Frequently Asked Questions
How do I find an inmate in Ripon?
Ask the Fond du Lac County Sheriff's Office at (920) 929-3394; its jail page SearchSystems verified is at fdlsheriff.com/jail/jail-information.
How many people are in the Fond du Lac County jail?
About 270 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 335 beds.
What is the phone number for the Fond du Lac County jail?
(920) 929-3394, the number on the page of the Fond du Lac County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Fond du Lac 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 Ripon 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.