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 24, 2026 and October 9, 2026.
Marshall County, Iowa, has about 40,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Marshall County is held at the county jail, run by the Marshall 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: Marshall County public records, Marshall County arrest records, Marshall County warrants, Marshall County criminal records, Marshall County court records, Iowa arrest records and Iowa inmate search.
Finding Someone in Custody in Marshall County
The county jail, run by the Marshall County Sheriff's Office, holds everyone kept in custody after an arrest in Marshall County, from every agency.
SearchSystems opened and checked the custody page of the Marshall County Sheriff's Office at sheriffmarshallcounty.org/current-inmate-roster (page title: Private Site), which answered when SearchSystems opened it on October 9, 2026.
That page is the place to look for someone booked recently. A person cited and released at the scene, or held only a few hours by a city department, will not be on it.
The Marshall County Jail by the Numbers
On an average day in 2023 the jail held about 110 people, down from about 140 in 2019. Its rated capacity in 2023 was 157 beds, and it ran at 69 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Marshall County has about 40,000 residents (2024 Census Bureau estimate), so the jail holds about 27 people for every 10,000 residents.
Who Books People Into the Marshall County Jail
The Marshall County Sheriff's Office and the agencies that report for Marshalltown and State Center make the arrests that end in a booking in Marshall County.
The largest arrest counts reported to the FBI were Marshalltown's 902 for 2025 and the Marshall County Sheriff's Office's 382 for 2021.
Marshalltown reported 902 arrests to the FBI for 2025. 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 Marshall 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 Marshall County serves the sentence in a facility of the Iowa Department of Corrections, whose inmate locator is at doc.iowa.gov/inmate-family-services.
Frequently Asked Questions
How do I find an inmate in Marshall County?
Look on the custody page of the Marshall County Sheriff's Office at sheriffmarshallcounty.org. It covers people booked into the county jail.
How many people are in the Marshall County jail?
About 110 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 157 beds.
Where do people sentenced to prison in Marshall County go?
To a facility of the Iowa Department of Corrections; its inmate locator is at doc.iowa.gov/inmate-family-services.
Is this the official Marshall 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.