It is the penultimate northbound station on the T Third Street, since T service moved to the Central Subway on January 7, 2023.

The main entrance is on Geary Street at the southeast corner of Union Square.

[7][8] San Francisco Chronicle architecture critic John King called Union Square/Market Street the "most disappointing in terms of design" of the Central Subway stations.

King criticized the bare concrete walls and large ceiling beams of the platform level, as well as the "nondescript" nature of the Union Square headhouse.

[9] The Central Subway will be closed from February 26 to March 14, 2025, for water leakage mitigation at Chinatown station.