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.
Boise County, Idaho, has about 8,600 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Boise County is held at the county jail, run by the Boise 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: Boise County public records, Boise County arrest records, Boise County warrants, Boise County criminal records, Boise County court records, Idaho arrest records and Idaho inmate search.
Finding Someone in Custody in Boise County
A person kept in custody after an arrest in Boise County is held at the county jail, run by the Boise County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Boise County Sheriff's Office at boisecounty.us/sheriffs-office (page title: Sheriff’s Office | Boise County), phone (208)392-4411, 3851 Highway 21 P.O. Box 189 Idaho City, ID 83631, 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)392-4411.
The Boise County Jail by the Numbers
On an average day in 2024 the jail held about 14 people, down from about 14 in 2019. Its rated capacity in 2023, the last year with a capacity figure, was 17 beds, and it ran at 82 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Boise County has about 8,600 residents (2024 Census Bureau estimate), so the jail holds about 16 people for every 10,000 residents.
Who Books People Into the Boise County Jail
The Boise County Sheriff's Office and the agency that reports for Idaho City make the arrests that end in a booking in Boise County.
The largest arrest counts reported to the FBI were the Boise County Sheriff's Office's 152 for 2025 and Idaho City's 13 for 2020.
The Boise County Sheriff's Office reported 152 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 Boise 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 Boise County?
Ask the Boise County Sheriff's Office at (208)392-4411; its jail page SearchSystems verified is at boisecounty.us/sheriffs-office.
How many people are in the Boise County jail?
About 14 on an average day in 2024, the latest year in the Vera Institute's jail data, against a rated capacity of 17 beds.
What is the phone number for the Boise County jail?
(208)392-4411, the number on the page of the Boise County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Boise County go?
To a facility of the Idaho Department of Correction; its inmate locator is at idoc.idaho.gov.
Is this the official Boise 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.