About how many people are being detained in the Jackson County Detention Center on a "typical" day? The "Average Daily Population" through July of 2008 was 814. The Detention Center's inmate population is made up primarily -- 79.9 percent in 2008 -- of individuals from Jackson County. When people are detained there, the Jackson County Department of Corrections assumes custody for them, essentially taking control over all aspects of their lives. With that control comes legal obligations to provide for the inmates' housing, food, health care and safety.