Arizona is a state in the Southwestern United States, achieving statehood in 1912. Arizona was a former territory of Spain and Mexico, respectively.
In Law & Order lore, Arizona is the home of Southwestern University, where Jacob Deiter encountered Daniel Tenofskie, whose identity he would steal in order to forge a new life for himself as a respected lawyer. (L&O: "Nowhere Man")
It was also the birthplace of Josie Knox, who was kicked out of her home at age 9 for complaining to her mother that her stepfather was raping her. (SVU: "Streetwise")
Gwendolyn Chapel was taken to her aunt's house in Arizona by Nicole Wallace after her father was arrested for murder. (CI: Grow)