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 23, 2026.
Siskiyou County, California, has about 42,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Siskiyou County is held at the county jail, run by the Siskiyou 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: Siskiyou County public records, Siskiyou County arrest records, Siskiyou County warrants, Siskiyou County police reports, Siskiyou County property records, California arrest records and California inmate search.
Finding Someone in Custody in Siskiyou County
The county jail, run by the Siskiyou County Sheriff's Office, holds everyone kept in custody after an arrest in Siskiyou County, from every agency.
SearchSystems opened and checked the jail page of the Siskiyou County Sheriff's Office at siskiyoucounty.gov/sheriff (page title: Sheriff's Office | Siskiyou County California), phone 530-842-8123, 305 Butte Street Yreka, CA 96097, which answered when SearchSystems opened it on September 23, 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 530-842-8123.
The Siskiyou County Jail by the Numbers
On an average day in 2025 the jail held about 110 people, up from about 68 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 104 beds, and it ran at 65 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Siskiyou County has about 42,000 residents (2024 Census Bureau estimate), so the jail holds about 26 people for every 10,000 residents.
Who Books People Into the Siskiyou County Jail
The Siskiyou County Sheriff's Office and the agencies that report for Yreka, Mount Shasta, Weed, Dunsmuir, Montague, Tulelake and three more cities make the arrests that end in a booking in Siskiyou County.
The FBI's agency list also places one other agency, one state agency and three state police units in Siskiyou County (the arrest records guide names each one).
The largest arrest counts reported to the FBI were Yreka's 720 for 2025, the Siskiyou County Sheriff's Office's 430 for 2025 and Mount Shasta's 147 for 2025.
Together, the 11 agencies in Siskiyou County with all twelve months of 2025 on file reported 1,438 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 Siskiyou 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 Siskiyou County serves the sentence in a facility of the California Department of Corrections and Rehabilitation, whose inmate locator is at cdcr.ca.gov/search.
Frequently Asked Questions
How do I find an inmate in Siskiyou County?
Ask the Siskiyou County Sheriff's Office at 530-842-8123; its jail page SearchSystems verified is at siskiyoucounty.gov/sheriff.
How many people are in the Siskiyou County jail?
About 110 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 104 beds.
What is the phone number for the Siskiyou County jail?
530-842-8123, the number on the page of the Siskiyou County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Siskiyou County go?
To a facility of the California Department of Corrections and Rehabilitation; its inmate locator is at cdcr.ca.gov/search.
Is this the official Siskiyou 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.