Arizona State Prison Phoenix-West is one of 13 prison facilities, a private prison operated by the GEO Group on contract with the Arizona Department of Corrections (ADC). ASP Phoenix-West is located in southwest Phoenix, Maricopa County, Arizona. ASP Phoenix-West has an inmate capacity of approximately 470 in 1 housing unit at security levels 2. The ADC uses a score classification system to assess inmates appropriate custody and security level placement.