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 23, 2026 and October 1, 2026.
Ukiah, California, in Mendocino County, has about 16,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Ukiah is held at the county jail, run by the Mendocino 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: Ukiah public records, Mendocino County inmate search, Ukiah arrest records, Ukiah warrants, Ukiah criminal records, Ukiah court records, California arrest records and California inmate search.
Finding Someone in Custody in Ukiah
The county jail, run by the Mendocino County Sheriff's Office, holds everyone kept in custody after an arrest in Ukiah, from every agency.
SearchSystems opened and checked the custody page of the Mendocino County Sheriff's Office at mendocinocounty.gov/government/inmate-locator (page title: Inmate Locator | Mendocino County, CA), which answered when SearchSystems opened it on September 23, 2026.
Someone booked recently shows on that page; someone cited and released at the scene, or held a few hours at a city station, does not.
The Mendocino County Jail by the Numbers
On an average day in 2025 the jail held about 240 people, down from about 290 in 2019. Its rated capacity in 2023, the last year with a capacity figure, was 301 beds, and it ran at 20 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Mendocino County has about 89,000 residents (2024 Census Bureau estimate), so the jail holds about 27 people for every 10,000 residents.
Who Books People Into the Mendocino County Jail
The Mendocino County Sheriff's Office and the agency that reports for Ukiah (filed by the FBI as Ukiah Police Department) make the arrests that end in a booking in and around Ukiah.
The FBI's agency list also places these agencies in Mendocino County: Union Pacific Railroad in Mendocino County (other agency); California Department of Forestry and Fire Protection at Mendocino (state agency); the Highway Patrol's Ukiah Area Office (state police).
The largest arrest counts reported to the FBI were Ukiah's 1,259 for 2025, the Mendocino County Sheriff's Office's 726 for 2025 and Fort Bragg's 294 for 2025.
Together, the four agencies in Mendocino County with all twelve months of 2025 on file reported 2,475 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 Ukiah arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the California Department of Corrections and Rehabilitation lists its inmates at cdcr.ca.gov/search.
Frequently Asked Questions
How do I find an inmate in Ukiah?
Look on the custody page of the Mendocino County Sheriff's Office at mendocinocounty.gov/government/inmate-locator. It covers people booked into the county jail.
How many people are in the Mendocino County jail?
About 240 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 301 beds.
Where do people sentenced to prison in Mendocino 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 Ukiah website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.