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 30, 2026.
Mammoth Lakes, California, in Mono County, has about 7,100 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Mammoth Lakes is held at the county jail, run by the Mono 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: Mammoth Lakes public records, Mono County inmate search, Mammoth Lakes arrest records, Mammoth Lakes warrants, Mammoth Lakes criminal records, Mammoth Lakes court records, California arrest records and California inmate search.
Finding Someone in Custody in Mammoth Lakes
The county jail, run by the Mono County Sheriff's Office, holds everyone kept in custody after an arrest in Mammoth Lakes, from every agency.
SearchSystems opened and checked the jail page of the Mono County Sheriff's Office at monosheriff.citizenrims.com (page title: Mono County Sheriff's Department | Incarcerated People), which answered when SearchSystems opened it on September 23, 2026.
That page is the office's jail information page rather than a roster.
The Mono County Jail by the Numbers
On an average day in 2025 the jail held about 19 people, down from about 30 in 2019. Its rated capacity in 2018, the last year with a capacity figure, was 48 beds, and it ran at 62 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Mono County has about 13,000 residents (2024 Census Bureau estimate), so the jail holds about 15 people for every 10,000 residents.
Who Books People Into the Mono County Jail
The Mono County Sheriff's Office and the agency that reports for Mammoth Lakes (filed by the FBI as Mammoth Lakes Police Department) make the arrests that end in a booking in and around Mammoth Lakes.
The FBI's agency list also places these agencies in Mono County: the Highway Patrol's Bridgeport, King City and Monterey Area Offices (state police).
The largest arrest counts reported to the FBI were Mammoth Lakes's 205 for 2025 and the Mono County Sheriff's Office's 113 for 2025.
Together, the two agencies in Mono County with all twelve months of 2025 on file reported 318 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 Mammoth Lakes 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 Mono 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 Mammoth Lakes?
Ask the Mono County Sheriff's Office; its jail page SearchSystems verified is at monosheriff.citizenrims.com.
How many people are in the Mono County jail?
About 19 on an average day in 2025, the latest year in the Vera Institute's jail data, against a rated capacity of 48 beds.
Where do people sentenced to prison in Mono 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 Mammoth Lakes 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.