[9] The Greater Valley Forge Transportation Management Association operates The Rambler, a community shuttle around Upper Merion Township that has two stops at the King of Prussia mall.

[12][14] King of Prussia mall is anchored by Nordstrom, Macy's, Neiman Marcus, Bloomingdale's, Dick's Sporting Goods, and Primark and a diverse merchant mix of over 450 stores, including a collection of luxury retailers.

[16] A covered outdoor walkway used to connect Macy's and Neiman Marcus prior to the recent expansion in 2016.

In 2018, King of Prussia was valued at $2.77 billion and had sales per square foot of $773, making it the 8th most valuable mall in the United States.

[17] The first portion of King of Prussia Plaza opened on September 18, 1962, as a modest open-air shopping mall.

[18] The mall carried an American Colonial theme, due to its proximity to the Revolutionary War encampment at Valley Forge State Park.

The 1400-seat Stanley Warner Plaza Theatre cinema opened on May 19, 1965, showing the Charlton Heston epic Major Dundee as its first feature.

A John Wanamaker anchor store opened on August 16, 1965, in a striking 194,000 sq ft, 3-level octagonal structure.

[22] By the 1970s, the mall was the largest shopping center in the east, with over 1 million sq ft, over 100 stores and parking for 27,000 cars.

It consisted of a small, fully enclosed section (connecting the three department stores) and a sprawling outdoor mall.

[26] It was demolished and replaced[27] by a food court and a 212,000 sq ft 2-story Sears "store of the future" anchor, which opened on July 25, 1983.

[28] In the 1980s, The Plaza featured Herman's World of Sporting Goods, and a Lionel "Kiddie City" toy store.

Stern's was replaced with JCPenney in 1992, moving from their original building in the middle of the Plaza, which was turned into mall space.

Lend Lease had bought its stake in the mall in 1996, with Kravco, Simon, and three family trusts owning the remaining 50 percent at the time.

[39] On November 29, 2011, Simon Property Group announced plans to create an additional 140,000-square-foot (13,000 m2) expansion/connector to connect The Court and The Plaza.

The 155,000-square-foot (14,400 m2) expansion also includes a new parking garage "with speed ramps, space location technology and valet service.

[45] Simon Property Group COO Rick Sokolov and U.S. Representative Brendan Boyle were present for the ribbon tying ceremony.

[52] The western section of the mall (also known as The Plaza) went under renovation in April 2018, which added new flooring and handrails, LED lighting, and additional soft seating areas and restrooms.

[56] In June 2022, it was announced that Wayfair, an online retailer of furniture and home goods, would open a brick-and-mortar store in the previous JCPenney outpost.

[58] It will be located in an area formerly occupied by Rite Aid, a portion of Forever 21, and a mall entrance, due to the requirement of a large space for the store.

In August 2020, Lord & Taylor announced it would close all its stores, as a result of the economic effects of the COVID-19 pandemic.

Netflix House will feature set replicas from shows and movies, as well as themed restaurants, a theater, and gift shops.