King of Prussia, PA utilizes an area code overlay in which area codes 484 and 610 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.
In addition to King of Prussia, PA area code information read more about area codes 484 and 610 details and Pennsylvania area codes.
King of Prussia, PA is located in Montgomery County and observes the Eastern Time Zone. View our Times by Area Code tool.