<page_title> List of the most populous counties in the United States </page_title> <section_title> List </section_title> <table> <cell> Marion <col_header> County </col_header> </cell> <cell> Indiana <col_header> State </col_header> </cell> <cell> 903,393 <col_header> April 1, 2010 census </col_header> </cell> </table>
Census 2010 recorded a population of 903,393, making Marion, Indiana the most populated county.