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.
Beaverhead County, Montana, has about 10,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Beaverhead County is held at the county jail, run by the Beaverhead 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: Beaverhead County public records, Beaverhead County arrest records, Beaverhead County warrants, Beaverhead County criminal records, Beaverhead County court records, Montana arrest records and Montana inmate search.
Finding Someone in Custody in Beaverhead County
The county jail, run by the Beaverhead County Sheriff's Office, holds everyone kept in custody after an arrest in Beaverhead County, from every agency.
SearchSystems opened and checked the jail page of the Beaverhead County Sheriff's Office at beaverheadcountymt.gov/departments/sheriff (page title: Sheriff | Beaverhead County), phone (406) 683-3700, 3778 Address 2 South Pacific Street, Suite 16 Dillon, MT 59725, Thursdays from 1:00 PM - 4:00 PM, which answered when SearchSystems opened it on September 24, 2026.
That page is the office's jail information page rather than a roster, so a search for a particular person goes through the office at (406) 683-3700.
The Beaverhead County Jail by the Numbers
On an average day in 2021 the jail held about 10 people, up from about 9 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 22 beds, and it ran at 41 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Beaverhead County has about 10,000 residents (2024 Census Bureau estimate), so the jail holds about 10 people for every 10,000 residents.
Who Books People Into the Beaverhead County Jail
The Beaverhead County Sheriff's Office and the agency that reports for Dillon make the arrests that end in a booking in Beaverhead County.
The largest arrest counts reported to the FBI were Dillon's 173 for 2025 and the Beaverhead County Sheriff's Office's 77 for 2025.
Together, the two agencies in Beaverhead County with all twelve months of 2025 on file reported 250 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 Beaverhead 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 Beaverhead County?
Ask the Beaverhead County Sheriff's Office at (406) 683-3700; its jail page SearchSystems verified is at beaverheadcountymt.gov/departments/sheriff.
How many people are in the Beaverhead County jail?
About 10 on an average day in 2021, the latest year in the Vera Institute's jail data, against a rated capacity of 22 beds.
What is the phone number for the Beaverhead County jail?
(406) 683-3700, the number on the page of the Beaverhead County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Beaverhead County go?
To a facility of the Montana Department of Corrections; its inmate locator is at offendersearch.mt.gov/conweb.
Is this the official Beaverhead 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.