Mark Stiles Unit
Mark W. Stiles Unit is a Texas Department of Criminal Justice prison for men, located in an unincorporated area of Jefferson County near Beaumont, Texas. The address is 3060 FM 3514, Beaumont, TX 77705, about 4 miles southeast of downtown Beaumont. The 776-acre facility sits next to the Gist Unit and the LeBlanc Unit and opened in June 1993. It can hold about 2,981 inmates and is managed by the TDCJ Corrections Institutions Division; the warden is Calvin Tucker.
Stiles serves as the University of Texas Medical Branch (UTMB) hub for treating HIV and other infectious diseases, so many prisoners there are HIV positive. A hospice for prisoners with HIV opened in 1997. The unit has offered Buddhist meditation classes since 2003. In 2011, the on-site metal products plant closed and its work moved to Coffield and Powledge Units.
In 2023, three inmate-on-inmate homicides occurred at Stiles, part of a rise in violence across Texas prisons that led to a statewide lockdown.
This page was last edited on 3 February 2026, at 07:24 (CET).