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.
McMullen County, Texas, has 565 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in McMullen County is held at the county jail, run by the McMullen 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: McMullen County public records, McMullen County arrest records, McMullen County warrants, McMullen County criminal records, McMullen County court records, Texas arrest records and Texas inmate search.
Finding Someone in Custody in McMullen County
The county jail, run by the McMullen County Sheriff's Office, holds everyone kept in custody after an arrest in McMullen County, from every agency.
SearchSystems opened and checked the jail page of the McMullen County Sheriff's Office at mcmullencounty.org/sherriff (page title: Sheriff | McMullen County), phone 361-274-3311, Monday - Friday 8:00am - 4:00pm, which answered when SearchSystems opened it on September 23, 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 361-274-3311.
The McMullen County Jail by the Numbers
On an average day in 2024 the jail held about 3 people, up from about 3 in 2019. Its rated capacity in 2024 was 4 beds, and it ran at 72 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
McMullen County has 565 residents (2024 Census Bureau estimate), so the jail holds about 53 people for every 10,000 residents.
Who Books People Into the McMullen County Jail
The McMullen County Sheriff's Office makes the arrests that end in a booking in McMullen County.
The McMullen County Sheriff's Office reported 12 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 McMullen 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 Texas Department of Criminal Justice lists its inmates at inmate.tdcj.texas.gov/InmateSearch/start.
Frequently Asked Questions
How do I find an inmate in McMullen County?
Ask the McMullen County Sheriff's Office at 361-274-3311; its jail page SearchSystems verified is at mcmullencounty.org/sherriff.
How many people are in the McMullen County jail?
About 3 on an average day in 2024, the latest year in the Vera Institute's jail data, against a rated capacity of 4 beds.
What is the phone number for the McMullen County jail?
361-274-3311, the number on the page of the McMullen County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in McMullen County go?
To a facility of the Texas Department of Criminal Justice; its inmate locator is at inmate.tdcj.texas.gov/InmateSearch/start.
Is this the official McMullen 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.