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 24, 2026 and September 25, 2026.
Sierra County, New Mexico, has about 11,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Sierra County is held at the county jail, run by the Sierra 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: Sierra County public records, Sierra County arrest records, Sierra County warrants, Sierra County criminal records, Sierra County court records, New Mexico arrest records and New Mexico inmate search.
Finding Someone in Custody in Sierra County
A person kept in custody after an arrest in Sierra County is held at the county jail, run by the Sierra County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Sierra County Sheriff's Office at sierraco.org/department/sheriff (page title: Sierra County Government | Sheriff’s Office), phone 575-894-9150, Tuesdays, Wednesdays & Thursdays From 9:00 AM to 12:00 PM, which answered when SearchSystems opened it on September 24, 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 575-894-9150.
The Sierra County Jail by the Numbers
On an average day in 2021 the jail held about 49 people, up from about 45 in 2019. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Sierra County has about 11,000 residents (2024 Census Bureau estimate), so the jail holds about 43 people for every 10,000 residents.
Who Books People Into the Sierra County Jail
The Sierra County Sheriff's Office and the agency that reports for Truth or Consequences make the arrests that end in a booking in Sierra County.
The largest arrest counts reported to the FBI were the Sierra County Sheriff's Office's 109 for 2025 and Truth or Consequences's 2 for 2025.
Together, the two agencies in Sierra County with all twelve months of 2025 on file reported 111 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 Sierra County arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the New Mexico Corrections Department lists its inmates at cd.nm.gov.
Frequently Asked Questions
How do I find an inmate in Sierra County?
Ask the Sierra County Sheriff's Office at 575-894-9150; its jail page SearchSystems verified is at sierraco.org/department/sheriff.
How many people are in the Sierra County jail?
About 49 on an average day in 2021, the latest year in the Vera Institute's jail data.
What is the phone number for the Sierra County jail?
575-894-9150, the number on the page of the Sierra County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Sierra County go?
To a facility of the New Mexico Corrections Department; its inmate locator is at cd.nm.gov.
Is this the official Sierra 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.