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 27, 2026.
Harrisonville, Missouri, in Cass County, has about 10,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Harrisonville is held at the county jail, run by the Cass 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: Harrisonville public records, Cass County inmate search, Harrisonville arrest records, Harrisonville warrants, Harrisonville criminal records, Harrisonville court records, Missouri arrest records and Missouri inmate search.
Finding Someone in Custody in Harrisonville
A person kept in custody after an arrest in Harrisonville is held at the county jail, run by the Cass County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Cass County Sheriff's Office at cassmosheriff.org/inmates/default.php (page title: In Custody CCSO Inmates), which answered when SearchSystems opened it on September 27, 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 Cass County Jail by the Numbers
On an average day in 2023 the jail held about 210 people, down from about 450 in 2019. Its rated capacity in 2023 was 252 beds, and it ran at 82 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Cass County has about 114,000 residents (2024 Census Bureau estimate), so the jail holds about 18 people for every 10,000 residents.
Who Books People Into the Cass County Jail
The Cass County Sheriff's Office and the agency that reports for Harrisonville (filed by the FBI as Harrisonville Police Department) make the arrests that end in a booking in and around Harrisonville.
The Lee's Summit Police Department, the Greenwood Police Department and the Kansas City Police Department are each listed by the FBI across several counties including Cass County, so their arrests are not broken out for Cass County here.
The largest arrest counts reported to the FBI were Belton's 907 for 2025, the Cass County Sheriff's Office's 414 for 2025 and Raymore's 397 for 2025.
Together, the nine agencies in Cass County with all twelve months of 2025 on file reported 2,076 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 Harrisonville arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Missouri Department of Corrections lists its inmates at web.mo.gov/doc/offSearchWeb.
Frequently Asked Questions
How do I find an inmate in Harrisonville?
Look on the custody page of the Cass County Sheriff's Office at cassmosheriff.org/inmates/default.php. It covers people booked into the county jail.
How many people are in the Cass County jail?
About 210 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 252 beds.
Where do people sentenced to prison in Cass County go?
To a facility of the Missouri Department of Corrections; its inmate locator is at web.mo.gov/doc/offSearchWeb.
Is this the official Harrisonville 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.