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.
Missoula County, Montana, has about 123,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Missoula County is held at the county jail, run by the Missoula 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: Missoula County public records, Missoula County arrest records, Missoula County warrants, Missoula County police reports, Missoula County property records, Montana arrest records and Montana inmate search.
Finding Someone in Custody in Missoula County
The county jail, run by the Missoula County Sheriff's Office, holds everyone kept in custody after an arrest in Missoula County, from every agency.
SearchSystems opened and checked the custody page of the Missoula County Sheriff's Office at webapps.missoulacounty.us/jailroster/CourtSchedule (page title: Missoula County Inmate Court Schedule | Missoula County Inmate Information Portal), phone (406) 258-4000, 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 Missoula County Jail by the Numbers
On an average day in 2023 the jail held about 340 people, up from about 270 in 2019. Its rated capacity in 2023 was 370 beds, and it ran at 93 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Missoula County has about 123,000 residents (2024 Census Bureau estimate), so the jail holds about 28 people for every 10,000 residents.
Who Books People Into the Missoula County Jail
The Missoula County Sheriff's Office and the agency that reports for Missoula make the arrests that end in a booking in Missoula County.
The FBI's agency list also places one more agency in Missoula County: the University of Montana (campus police).
The largest arrest counts reported to the FBI were Missoula's 3,409 for 2025 and the Missoula County Sheriff's Office's 423 for 2025.
Together, the two agencies in Missoula County with all twelve months of 2025 on file reported 3,832 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 Missoula 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 Montana Department of Corrections lists its inmates at offendersearch.mt.gov/conweb.
Frequently Asked Questions
How do I find an inmate in Missoula County?
Look on the custody page of the Missoula County Sheriff's Office at webapps.missoulacounty.us, or call (406) 258-4000. It covers people booked into the county jail.
How many people are in the Missoula County jail?
About 340 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 370 beds.
What is the phone number for the Missoula County jail?
(406) 258-4000, the number on the page of the Missoula County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Missoula County go?
To a facility of the Montana Department of Corrections; its inmate locator is at offendersearch.mt.gov/conweb.
Is this the official Missoula 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.