The eponymous King of Prussia Inn was originally constructed as a cottage in 1719 by the Welsh Quakers William and Janet Rees, founders of Reesville. History King of Prussia Inn, a local tavern A King of Prussia sign on US 202 It is considered part of the larger Philadelphia metropolitan area. King of Prussia is located 35 miles (56 km) southeast of Allentown and 15 miles (24 km) northwest of Philadelphia. King of Prussia is considered to be an edge city of Philadelphia, consisting of large amounts of retail and office space situated at the convergence of four highways. Also located here is the headquarters of the Nuclear Regulatory Commission Region I and the headquarters of American Baptist Churches USA, a major Christian denomination in the U.S. King of Prussia mall, the nation's fifth-largest shopping mall as of 2023, is located in King of Prussia. Like the rest of Montgomery County, King of Prussia continues to experience rapid development. The community took its unusual name in the 18th century from a local tavern named the King of Prussia Inn, which was named after King Frederick the Great of Prussia. As of the 2020 census, its population was 22,028. King of Prussia (also referred to as KOP) is a census-designated place in Upper Merion Township in Montgomery County, Pennsylvania, United States.

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