Home  >   Pennsylvania  >   King Of Prussia

King of Prussia Census-designated place Country United States State Pennsylvania County Montgomery Township Upper Merion Area 8.5  miﾲ (22  kmﾲ )  - land 8.4  miﾲ (21.8  kmﾲ )  - water 0.1  miﾲ (0.3  kmﾲ ), 1.18% Center  - coordinates 40ﾰ052413N, 75ﾰ222413W  - elevation 200  ft (61  m ) Population 18,511 ( 2000 ) Density 2,202.4 / miﾲ (850.4 / kmﾲ ) Time zone EST ( UTC-5 )  -  summer (DST) EDT ( UTC-4 ) Area code 610 , 484 Location of King of Prussia in Pennsylvania Location of Pennsylvania in the United States King of Prussia is an unincorporated community in Upper Merion Township , Montgomery County , Pennsylvania , United States . As of the 2000 census, its population was 18,511. The community took its name in the 18th century from a local tavern named "The King of Prussia Inn", which was named for Frederick II, King of Prussia . Like the rest of Montgomery County, King of Prussia continues to experience rapid development. Residents often refer to King of Prussia in print as "KoP", and in conversation as "K.O.P.". One of the largest shopping malls in the United States, the King of Prussia Mall , is located here.