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.
Fallon County, Montana, has about 2,900 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Fallon County is held at the county jail, run by the Fallon 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: Fallon County public records, Fallon County arrest records, Fallon County warrants, Fallon County criminal records, Fallon County court records, Montana arrest records and Montana inmate search.
Finding Someone in Custody in Fallon County
The county jail, run by the Fallon County Sheriff's Office, holds everyone kept in custody after an arrest in Fallon County, from every agency.
SearchSystems opened and checked the jail page of the Fallon County Sheriff's Office at falloncountymt.gov/sheriff (page title: Fallon County Sheriff’s Office | Fallon County), phone 800-943-2189, 10 West Fallon Avenue Baker, MT 59313, Wednesday and Friday 1:30 p.m. to 3:30 p.m., 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 800-943-2189.
The Fallon County Jail by the Numbers
On an average day in 2019 the jail held about 3 people. Its rated capacity in 2019 was 10 beds, and it ran at 29 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Fallon County has about 2,900 residents (2024 Census Bureau estimate), so the jail holds about 10 people for every 10,000 residents.
Who Books People Into the Fallon County Jail
The Fallon County Sheriff's Office and the agency that reports for Baker make the arrests that end in a booking in Fallon County.
The largest arrest counts reported to the FBI were Baker's 14 for 2025 and the Fallon County Sheriff's Office's 3 for 2025.
Together, the two agencies in Fallon County with all twelve months of 2025 on file reported 17 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 Fallon 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 Fallon County?
Ask the Fallon County Sheriff's Office at 800-943-2189; its jail page SearchSystems verified is at falloncountymt.gov/sheriff.
How many people are in the Fallon County jail?
About 3 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 10 beds.
What is the phone number for the Fallon County jail?
800-943-2189, the number on the page of the Fallon County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Fallon County go?
To a facility of the Montana Department of Corrections; its inmate locator is at offendersearch.mt.gov/conweb.
Is this the official Fallon 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.