O. B. Ellis Unit (E1, previously Ellis I Unit) is a Texas Department of Criminal Justice prison located in unincorporated Walker County, Texas, 12 miles (19 km) north of Huntsville.
O. B. Ellis Unit (E1, previously Ellis I Unit) is a Texas Department of Criminal Justice prison located in unincorporated Walker County, Texas, 12 miles (19 km) north of Huntsville.
Prisons 
