“Oz” is the nickname for the Oswald State Correctional Facility, formerly Oswald State Penitentiary, a fictional level 4 maximum-security state prison, apparently in New York (given the New York state flag and motto seen in the background when public officials are shown speaking publicly, references to “upstate”, a term commonly used in New York, and the format of the prisoner ID numbers). The prison is most likely named after New York Commissioner of Correctional Services Russell George Oswald, who was the head of New York’s penal system at the time of the Attica Prison riot. The character Tim McManus refers to Attica as his hometown and the riot as his original impetus for his wanting to set up Emerald City.
The nickname “Oz” is also a reference to the classic film The Wizard of Oz (1939), which popularized the phrase “There’s no place like home.” In contrast, a poster for the series uses the tagline: “It’s no place like home”.  Moreover, most of the series’ story arcs are set in “Emerald City“, a setting from the fictional Land of Oz in L. Frank Baum’s Oz books, first described in The Wonderful Wizard of Oz (1900).
Genre : Crime, Drama, Romance