List of US Post Office Stores in King of Prussia, PA Outlet Note Regular Brands US Post Office Pennsylvania King of Prussia Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - King Of Prussia 741 3rd Ave (610) 337-9823 US Post Office outlet - King Of Prussia 620 Allendale Rd, #125 (610) 337-4694 US Post Office outlet - King Of Prussia 680 Allendale Rd (610) 265-5350 People Also Viewed