Two cable car lines (Powell-Hyde and Powell-Mason) serve Union Square on Powell Street.

In addition, Union Square is served by many trolleybus and bus lines and the F Market heritage streetcar.
The Muni Metro and BART subway systems both serve the area at nearby Powell Street Station on Market Street.
In 2012, Muni began building an extension of its Muni Metro system to connect Union Square and Chinatown with Caltrain and other neighborhoods in San Francisco.
After several delays, the extension, known as the Central Subway, is scheduled for completion by 2020, and the new Union Square station will be called Union Square/Market Street.
Two cable car lines (Powell-Hyde and Powell-Mason) serve Union Square on Powell Street.
In addition, Union Square is served by many trolleybus and bus lines and the F Market heritage streetcar. The Muni Metro and BART subway systems both serve the area at nearby Powell Street Station on Market Street. In 2012, Muni began building an extension of its Muni Metro system to connect Union Square and Chinatown with Caltrain and other neighborhoods in San Francisco. After several delays, the extension, known as the Central Subway, is scheduled for completion by 2020, and the new Union Square station will be called Union Square/Market Street.
Union Square, San Francisco