The Pima County Jail is a facility that is owned by the government of Pima County, and operated by the Pima County Sheriff’s Department. The jail is where Pima County detains men and women over the age of 18, more than 80% of whom are on pretrial status, which means they are awaiting trial and have not yet been convicted of a crime. (This is opposed to the prisons run by the Arizona Department of Corrections, which are owned by the state government and house men and women serving sentences for crimes that they have already been convicted of.)
The Pima County Jail’s population averaged 2,136 inmates a day in 2014, close to its full capacity of 2,377 inmates.
You can find the website for the Pima County Jail, including information on inmate property, inmate phone service, and visitation information here.