Mark W. Stiles Unit is a Texas Department of Criminal Justice men's prison located in an unincorporated area of Jefferson County, Texas, near Beaumont. The unit, located along Farm to Market Road 3514, is 4 miles (6.4 km) southeast of downtown Beaumont. The approximately 776 acres (314 ha) unit is co-located with the and the . The unit has offered Buddhist meditation classes since 2003. In 2011 the metal products plant closed; its operations were consolidated to the plants at the Coffield Unit and the Powledge Unit.