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.
Mariposa County, California, has about 17,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Mariposa County is held at the county jail, run by the Mariposa 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: Mariposa County public records, Mariposa County arrest records, Mariposa County warrants, Mariposa County criminal records, Mariposa County court records, California arrest records and California inmate search.
Finding Someone in Custody in Mariposa County
A person kept in custody after an arrest in Mariposa County is held at the county jail, run by the Mariposa County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Mariposa County Sheriff's Office at mariposacounty.gov/DocumentCenter/View/97393/BOOKING-REPORT-09212026 (page title: Booking # 2026-00448 Jailing Party Name Arrest Date Time Release Date), 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 Mariposa County Jail by the Numbers
On an average day in 2025 the jail held about 33 people, down from about 44 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 58 beds, and it ran at 75 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Mariposa County has about 17,000 residents (2024 Census Bureau estimate), so the jail holds about 19 people for every 10,000 residents.
Who Books People Into the Mariposa County Jail
The Mariposa County Sheriff's Office makes the arrests that end in a booking in Mariposa County.
The FBI's agency list also places these agencies in Mariposa County: California Department of Forestry and Fire Protection at Madera-Mariposa-Merced (state agency); the Highway Patrol's Mariposa Area Office (state police).
The Mariposa County Sheriff's Office reported 262 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 Mariposa 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 Mariposa 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 Mariposa County?
Look on the custody page of the Mariposa County Sheriff's Office at mariposacounty.gov. It covers people booked into the county jail.
How many people are in the Mariposa County jail?
About 33 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 58 beds.
Where do people sentenced to prison in Mariposa 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 Mariposa 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.