<page_title> List of United States light rail systems by ridership </page_title> <section_title> List </section_title> <table> <cell> Los Angeles <col_header> Largest city served </col_header> </cell> <cell> Boston <col_header> Largest city served </col_header> </cell> <cell> San Francisco <col_header> Largest city served </col_header> </cell> <cell> 4 <col_header>  </col_header> </cell> <cell> MAX Light Rail <col_header> System </col_header> </cell> <cell> 39,173,700 <col_header> Annual Ridership (2017) </col_header> </cell> </table>
With nearly 39 million annual riders MAX is the fourth light rail system in the United States after light rail services in Los Angeles, Boston, and San Francisco.