Reviewed and updated October 11, 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 24, 2026 and October 11, 2026.
Los Alamos County, New Mexico, has about 20,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Los Alamos County is held at the county jail, 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: Los Alamos County public records, Los Alamos County arrest records, Los Alamos County warrants, Los Alamos County criminal records, Los Alamos County court records, New Mexico arrest records and New Mexico inmate search.
Finding Someone in Custody in Los Alamos County
The county jail holds everyone kept in custody after an arrest in Los Alamos County, from every agency.
SearchSystems opened and checked the jail page of the sheriff's office at losalamosnm.gov/Government/Departments-offices/Police-Department/De... (page title: Detention Center | Incorporated County of Los Alamos, NM), phone (505) 662-8222, which answered when SearchSystems opened it on October 11, 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 (505) 662-8222.
The Los Alamos County Jail by the Numbers
On an average day in 2023 the jail held about 5 people, down from about 15 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 32 beds, and it ran at 47 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Los Alamos County has about 20,000 residents (2024 Census Bureau estimate), so the jail holds about 3 people for every 10,000 residents.
Who Books People Into the Los Alamos County Jail
Los Alamos reported 5 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 Los Alamos 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 Los Alamos County serves the sentence in a facility of the New Mexico Corrections Department, whose inmate locator is at cd.nm.gov.
Frequently Asked Questions
How do I find an inmate in Los Alamos County?
Ask the sheriff's office at (505) 662-8222; its jail page SearchSystems verified is at losalamosnm.gov.
How many people are in the Los Alamos County jail?
About 5 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 32 beds.
What is the phone number for the Los Alamos County jail?
(505) 662-8222, the number on the page of the sheriff's office SearchSystems verified.
Where do people sentenced to prison in Los Alamos County go?
To a facility of the New Mexico Corrections Department; its inmate locator is at cd.nm.gov.
Is this the official Los Alamos 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.