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 October 9, 2026.
Fremont County, Idaho, has about 14,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Fremont County is held at the county jail, run by the Fremont 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: Fremont County public records, Fremont County arrest records, Fremont County warrants, Fremont County criminal records, Fremont County court records, Idaho arrest records and Idaho inmate search.
Finding Someone in Custody in Fremont County
A person kept in custody after an arrest in Fremont County is held at the county jail, run by the Fremont County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Fremont County Sheriff's Office at fremontcountyid.gov/259/Sheriff (page title: Staff Directory, Sheriff), phone 208-624-4482, 146 N 2nd West St. Anthony, ID 83445, a site that blocks automated checks (HTTP 403), so open it in a browser.
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 208-624-4482.
The Fremont County Jail by the Numbers
On an average day in 2019 the jail held about 24 people. Its rated capacity in 2019 was 20 beds, and it ran at 120 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Fremont County has about 14,000 residents (2024 Census Bureau estimate), so the jail holds about 17 people for every 10,000 residents.
Who Books People Into the Fremont County Jail
The Fremont County Sheriff's Office and the agencies that report for St. Anthony and Ashton make the arrests that end in a booking in Fremont County.
The largest arrest counts reported to the FBI were the Fremont County Sheriff's Office's 160 for 2025, St. Anthony's 76 for 2025 and Ashton's 19 for 2022.
Together, the two agencies in Fremont County with all twelve months of 2025 on file reported 236 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 Fremont 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 Idaho Department of Correction lists its inmates at idoc.idaho.gov/content/prisons/resident-client-search.
Frequently Asked Questions
How do I find an inmate in Fremont County?
Ask the Fremont County Sheriff's Office at 208-624-4482; its jail page SearchSystems verified is at fremontcountyid.gov/259/Sheriff.
How many people are in the Fremont County jail?
About 24 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 20 beds.
What is the phone number for the Fremont County jail?
208-624-4482, the number on the page of the Fremont County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Fremont County go?
To a facility of the Idaho Department of Correction; its inmate locator is at idoc.idaho.gov.
Is this the official Fremont 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.