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.
Musselshell County, Montana, has about 5,500 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Musselshell County is held at the county jail, run by the Musselshell 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: Musselshell County public records, Musselshell County arrest records, Musselshell County warrants, Musselshell County criminal records, Musselshell County court records, Montana arrest records and Montana inmate search.
Finding Someone in Custody in Musselshell County
The county jail, run by the Musselshell County Sheriff's Office, holds everyone kept in custody after an arrest in Musselshell County, from every agency.
SearchSystems opened and checked the jail page of the Musselshell County Sheriff's Office at musselshellcounty.gov/sheriffs-office (page title: Sheriff’s Office | MUSSELSHELL COUNTY), phone 406-323-1402, 820 Main Street Roundup, MT 59072, 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 406-323-1402.
The Musselshell County Jail by the Numbers
On an average day in 2018 the jail held about 6 people. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Musselshell County has about 5,500 residents (2024 Census Bureau estimate), so the jail holds about 11 people for every 10,000 residents.
Who Books People Into the Musselshell County Jail
The Musselshell County Sheriff's Office makes the arrests that end in a booking in Musselshell County.
The Musselshell County Sheriff's Office reported 46 arrests to the FBI for 2025. 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 Musselshell 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 Musselshell 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 Musselshell County?
Ask the Musselshell County Sheriff's Office at 406-323-1402; its jail page SearchSystems verified is at musselshellcounty.gov/sheriffs-office.
How many people are in the Musselshell County jail?
About 6 on an average day in 2018, the latest year in the Vera Institute's jail data.
What is the phone number for the Musselshell County jail?
406-323-1402, the number on the page of the Musselshell County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Musselshell County go?
To a facility of the Montana Department of Corrections; its inmate locator is at offendersearch.mt.gov/conweb.
Is this the official Musselshell 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.