Florence is a town in and the county seat of Pinal County, Arizona, United States. The population was 25,536 at the 2010 census. The oldest functioning Arizona State Prison complex, the Florence complex, is located in the town, and its preserved Main Street and open desert scenery was the setting of the major motion picture Murphy's Romance. There are a total of 9 prisons from the county, state, federal and two private prisons. There are 3 state prisons located in Florence.