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 on September 24, 2026.
Sumner County, Kansas, has about 22,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Sumner County is held at the county jail, run by the Sumner 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: Sumner County public records, Sumner County arrest records, Sumner County warrants, Sumner County police reports, Kansas arrest records and Kansas inmate search.
Finding Someone in Custody in Sumner County
A person kept in custody after an arrest in Sumner County is held at the county jail, run by the Sumner County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Sumner County Sheriff's Office at sumnersheriff.net/agency-data/jail-roster (page title: Jail Roster | Sumner County, KS | Sheriff 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 Sumner County Jail by the Numbers
On an average day in 2022 the jail held about 110 people, down from about 160 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 185 beds, and it ran at 84 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Sumner County has about 22,000 residents (2024 Census Bureau estimate), so the jail holds about 49 people for every 10,000 residents.
Who Books People Into the Sumner County Jail
The Sumner County Sheriff's Office and the agencies that report for Wellington, Belle Plaine, Conway Springs, Oxford, Caldwell and Argonia make the arrests that end in a booking in Sumner County.
The FBI's agency list also places one more agency in Sumner County: Kansas Racing and Gaming Commission Law Enforcement (state agency).
The Mulvane Police Department is listed by the FBI across two counties including Sumner County, so its arrests are not broken out for Sumner County here.
The largest arrest counts reported to the FBI were Wellington's 263 for 2025, the Sumner County Sheriff's Office's 194 for 2025 and Oxford's 19 for 2022.
Together, the three agencies in Sumner County with all twelve months of 2024 on file reported 509 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 Sumner County arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Kansas Department of Corrections lists its inmates at doc.ks.gov/@@search?SearchableText=inmate+search.
Frequently Asked Questions
How do I find an inmate in Sumner County?
Look on the custody page of the Sumner County Sheriff's Office at sumnersheriff.net/agency-data/jail-roster. It covers people booked into the county jail.
How many people are in the Sumner County jail?
About 110 on an average day in 2022, the latest year in the Vera Institute's jail data, against a rated capacity of 185 beds.
Where do people sentenced to prison in Sumner County go?
To a facility of the Kansas Department of Corrections; its inmate locator is at doc.ks.gov.
Is this the official Sumner 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.