The market hall is a two-story structure built in a Greek Revival style, with two long gable-roofed wings stretching to the east and west from a central rotunda with a lantern dome enclosed by a stone parapet. Each wing ends in a portico of Doric-style columnns. The wings are composed of a remarkable serial post-and-lintel structure of granite slabs, which allows for the large round-arched and square-headed windows. Inside, the building is supported by massive cast iron pillars along the central aisle. It contains 128 market stalls and stores.
Today, Quincy Hall continues to operate as part of the Faneuil Hall Marketplace complex, which consists of the North and South
Market Streets and another listed National Historic Landmark: Faneuil Hall. It continues to be used for commercial purposes to this day.