The mecca of malls, located in King of Prussia, Pennsylvania. "K-O-P", as it is popularly known in the surrounding region, houses the largest collection of retail stores in the United States. It is also home to the only Neiman Marcus store in the Philadelphia metropolitan area. When upscale retailers decide to open a store in the Philadelphia region, King of Prussia is usually the first or second choice. Over the past 50 years, King of Prussia has grown into one of the most prominent edge cities on the East Coast.
Since the town of King of Prussia is virtually indistinguishable from the mall, the people who live there refer to themselves as living in Upper Merion Township to avoid confusion.