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 2, 2026.
St. Helena, California, in Napa County, has about 5,300 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in St. Helena is held at the county jail, run by the Napa 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: St. Helena public records, Napa County inmate search, St. Helena arrest records, St. Helena warrants, St. Helena criminal records, St. Helena court records, California arrest records and California inmate search.
Finding Someone in Custody in St. Helena
The county jail, run by the Napa County Sheriff's Office, holds everyone kept in custody after an arrest in St. Helena, from every agency.
SearchSystems opened and checked the custody page of the Napa County Sheriff's Office at app.napacounty.gov/CJNet/Public/BookingReport (page title: Jail Booking Report | County of Napa), which answered when SearchSystems opened it on September 23, 2026.
That page is the place to look for someone booked recently. A person cited and released at the scene, or held only a few hours by a city department, will not be on it.
The Napa County Jail by the Numbers
On an average day in 2025 the jail held about 220 people, down from about 250 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 275 beds, and it ran at 92 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Napa County has about 133,000 residents (2024 Census Bureau estimate), so the jail holds about 16 people for every 10,000 residents.
Who Books People Into the Napa County Jail
The Napa County Sheriff's Office and the agency that reports for St. Helena (filed by the FBI as St. Helena Police Department) make the arrests that end in a booking in and around St. Helena.
The FBI's agency list also places two other agencies, one state agency and one state police unit in Napa County (the arrest records guide names each one).
The largest arrest counts reported to the FBI were Napa's 1,007 for 2025, American Canyon's 518 for 2025 and the Napa County Sheriff's Office's 324 for 2025.
Together, the six agencies in Napa County with all twelve months of 2025 on file reported 2,071 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 St. Helena 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 St. Helena?
Look on the custody page of the Napa County Sheriff's Office at app.napacounty.gov/CJNet/Public/BookingReport. It covers people booked into the county jail.
How many people are in the Napa County jail?
About 220 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 275 beds.
Where do people sentenced to prison in Napa 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 St. Helena 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.