<page_title> List of the most populous counties in the United States </page_title> <section_title> List </section_title> <table> <cell> Los Angeles <col_header> County </col_header> </cell> <cell> California <col_header> State </col_header> </cell> <cell> San Bernardino <col_header> County </col_header> </cell> </table>
California has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County.