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. Every office link was opened and checked against the office's own site between September 24, 2026 and October 2, 2026.
Sweet Grass County, Montana, has about 3,800 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Sweet Grass County is held at the county jail, run by the Sweet Grass 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, who books people, state prison and common questions.
Related guides: Sweet Grass County public records, Sweet Grass County arrest records, Sweet Grass County warrants, Sweet Grass County criminal records, Sweet Grass County court records, Montana arrest records and Montana inmate search.
Finding Someone in Custody in Sweet Grass County
A person kept in custody after an arrest in Sweet Grass County is held at the county jail, run by the Sweet Grass County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Sweet Grass County Sheriff's Office at sgcountymt.gov/government-departments/county-govt/sheriff (page title: Sheriff’s Office | Sweet Grass County Montana), phone (406) 932-5143, which answered when SearchSystems opened it on September 30, 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) 932-5143.
Who Books People Into the Sweet Grass County Jail
The Sweet Grass County Sheriff's Office makes the arrests that end in a booking in Sweet Grass County.
The Sweet Grass County Sheriff's Office reported 55 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 Sweet Grass 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 Sweet Grass 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 Sweet Grass County?
Ask the Sweet Grass County Sheriff's Office at (406) 932-5143; its jail page SearchSystems verified is at sgcountymt.gov.
What is the phone number for the Sweet Grass County jail?
(406) 932-5143, the number on the page of the Sweet Grass County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Sweet Grass County go?
To a facility of the Montana Department of Corrections; its inmate locator is at offendersearch.mt.gov/conweb.
Is this the official Sweet Grass 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.