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 September 30, 2026.
Hamilton County, Iowa, has about 15,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Hamilton County is held at the county jail, run by the Hamilton 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: Hamilton County public records, Hamilton County arrest records, Hamilton County warrants, Hamilton County criminal records, Hamilton County court records, Iowa arrest records and Iowa inmate search.
Finding Someone in Custody in Hamilton County
A person kept in custody after an arrest in Hamilton County is held at the county jail, run by the Hamilton County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Hamilton County Sheriff's Office at hcso.org/justice-center-services/inmate-search (page title: Hamilton County Justice Center | Inmate Search | Hamilton County Sheriff's Office), which answered when SearchSystems opened it on September 24, 2026.
Someone booked recently shows on that page; someone cited and released at the scene, or held a few hours at a city station, does not.
The Hamilton County Jail by the Numbers
On an average day in 2019 the jail held about 15 people. Its rated capacity in 2019 was 55 beds, and it ran at 27 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Hamilton County has about 15,000 residents (2024 Census Bureau estimate), so the jail holds about 10 people for every 10,000 residents.
Who Books People Into the Hamilton County Jail
The Hamilton County Sheriff's Office and the agency that reports for Webster City make the arrests that end in a booking in Hamilton County.
The largest arrest counts reported to the FBI were Webster City's 273 for 2024 and the Hamilton County Sheriff's Office's 122 for 2025.
Together, the two agencies in Hamilton County with all twelve months of 2024 on file reported 412 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 Hamilton 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 Hamilton 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 Hamilton County?
Look on the custody page of the Hamilton County Sheriff's Office at hcso.org. It covers people booked into the county jail.
How many people are in the Hamilton County jail?
About 15 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 55 beds.
Where do people sentenced to prison in Hamilton 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 Hamilton 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.