Reviewed and updated October 11, 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 11, 2026.
Gallatin County, Montana, has about 127,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Gallatin County is held at the county jail, run by the Gallatin 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: Gallatin County public records, Gallatin County arrest records, Gallatin County warrants, Gallatin County criminal records, Gallatin County court records, Montana arrest records and Montana inmate search.
Finding Someone in Custody in Gallatin County
The county jail, run by the Gallatin County Sheriff's Office, holds everyone kept in custody after an arrest in Gallatin County, from every agency.
SearchSystems opened and checked the jail page of the Gallatin County Sheriff's Office at gallatinmt.gov/643/Sheriffs-Office (page title: Sheriff's Office | Gallatin County, MT), 311 W. Main St. Room 202A Bozeman, MT 59715, which answered when SearchSystems opened it on October 11, 2026.
That page is the office's jail information page rather than a roster.
The Gallatin County Jail by the Numbers
On an average day in 2019 the jail held about 140 people. Its rated capacity in 2019 was 170 beds, and it ran at 81 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Gallatin County has about 127,000 residents (2024 Census Bureau estimate), so the jail holds about 11 people for every 10,000 residents.
Who Books People Into the Gallatin County Jail
The Gallatin County Sheriff's Office and the agencies that report for Bozeman, Belgrade, Manhattan and West Yellowstone make the arrests that end in a booking in Gallatin County.
The FBI's agency list also places one more agency in Gallatin County: Montana State University (campus police).
The largest arrest counts reported to the FBI were Bozeman's 1,433 for 2025, the Gallatin County Sheriff's Office's 647 for 2025 and Belgrade's 409 for 2025.
Together, the five agencies in Gallatin County with all twelve months of 2025 on file reported 2,546 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 Gallatin 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 Gallatin County serves the sentence in a facility of the Montana Department of Corrections, whose inmate locator is at offendersearch.mt.gov/conweb.
Frequently Asked Questions
How do I find an inmate in Gallatin County?
Ask the Gallatin County Sheriff's Office; its jail page SearchSystems verified is at gallatinmt.gov/643/Sheriffs-Office.
How many people are in the Gallatin County jail?
About 140 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 170 beds.
Where do people sentenced to prison in Gallatin County go?
To a facility of the Montana Department of Corrections; its inmate locator is at offendersearch.mt.gov/conweb.
Is this the official Gallatin 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.