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 September 26, 2026.
Williams, California, in Colusa County, has about 5,600 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Williams is held at the county jail, run by the Colusa 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: Williams public records, Colusa County inmate search, Williams arrest records, Williams warrants, Williams police reports, Williams property records, California arrest records and California inmate search.
Finding Someone in Custody in Williams
The county jail, run by the Colusa County Sheriff's Office, holds everyone kept in custody after an arrest in Williams, from every agency.
SearchSystems opened and checked the jail page of the Colusa County Sheriff's Office at countyofcolusaca.gov/m/directory/department?did=20 (page title: Staff Directory, Sheriff), phone (530) 458-0200, 929 Bridge Street Colusa, CA 95932, Monday through Sunday 8 am to 4 pm, 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) 458-0200.
The Colusa County Jail by the Numbers
On an average day in 2025 the jail held about 54 people, down from about 70 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 92 beds, and it ran at 76 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Colusa County has about 22,000 residents (2024 Census Bureau estimate), so the jail holds about 24 people for every 10,000 residents.
Who Books People Into the Colusa County Jail
The Colusa County Sheriff's Office and the agency that reports for Williams (filed by the FBI as Williams Police Department) make the arrests that end in a booking in and around Williams.
The FBI's agency list also places these agencies in Colusa County: Union Pacific Railroad in Colusa County (other agency); the Highway Patrol's Williams Area Office (state police).
The largest arrest counts reported to the FBI were Colusa's 101 for 2025, Williams's 90 for 2025 and the Colusa County Sheriff's Office's 89 for 2025.
Together, the three agencies in Colusa County with all twelve months of 2025 on file reported 280 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 Williams 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 Williams?
Ask the Colusa County Sheriff's Office at (530) 458-0200; its jail page SearchSystems verified is at countyofcolusaca.gov.
How many people are in the Colusa County jail?
About 54 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 92 beds.
What is the phone number for the Colusa County jail?
(530) 458-0200, the number on the page of the Colusa County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Colusa 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 Williams 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.