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 2, 2026.
Linn County, Iowa, has about 232,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Linn County is held at the county jail, run by the Linn 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: Linn County public records, Linn County arrest records, Linn County warrants, Linn County criminal records, Linn County court records, Iowa arrest records and Iowa inmate search.
Finding Someone in Custody in Linn County
A person kept in custody after an arrest in Linn County is held at the county jail, run by the Linn County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Linn County Sheriff's Office at linncountyiowa.gov/151/Sheriffs-Office (page title: Sheriff's Office | Linn County, IA), phone 319-892-6100, Monday-Friday 8 a.m.-4 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 319-892-6100.
The Linn County Jail by the Numbers
On an average day in 2023 the jail held about 380 people, down from about 390 in 2019. Its rated capacity in 2023 was 401 beds, and it ran at 94 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Linn County has about 232,000 residents (2024 Census Bureau estimate), so the jail holds about 16 people for every 10,000 residents.
Who Books People Into the Linn County Jail
The Linn County Sheriff's Office and the agencies that report for Cedar Rapids, Marion, Hiawatha, Mount Vernon and Robins make the arrests that end in a booking in Linn County.
The FBI's agency list also places one more agency in Linn County: Eastern Iowa Airport Public Safety (other agency).
The largest arrest counts reported to the FBI were Cedar Rapids's 5,113 for 2025, the Linn County Sheriff's Office's 338 for 2025 and Marion's 262 for 2025.
Together, the five agencies in Linn County with all twelve months of 2025 on file reported 5,750 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 Linn 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 Linn 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 Linn County?
Ask the Linn County Sheriff's Office at 319-892-6100; its jail page SearchSystems verified is at linncountyiowa.gov/151/Sheriffs-Office.
How many people are in the Linn County jail?
About 380 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 401 beds.
What is the phone number for the Linn County jail?
319-892-6100, the number on the page of the Linn County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Linn 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 Linn 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.