King of Prussia is a census-designated place (CDP) in Upper Merion Township, Montgomery County, Pennsylvania, United States. It is known for its massive King of Prussia Mall, one of the largest shopping malls in the United States in terms of retail space. Situated at the intersection of several major roadways, including the Pennsylvania Turnpike (I-76), U.S. Route 202, and U.S. Route 422, it serves as a significant commercial hub and a major employment center in the Philadelphia metropolitan area. Beyond the mall, King of Prussia hosts numerous office parks, corporate headquarters, and a growing residential community. Its strategic location makes it a gateway to both urban Philadelphia and the surrounding suburban and rural areas of Montgomery County. The area has experienced significant development and continues to attract businesses and residents due to its economic opportunities and accessibility.