<page_title> San Marcos, California </page_title> <section_title> Demographics </section_title> <table> <cell> 2010 <col_header> Historical population </col_header> <col_header> Census </col_header> </cell> <cell> 83,781 <col_header> Historical population </col_header> <col_header> Pop. </col_header> </cell> <cell> U.S. Decennial Census <col_header> Historical population </col_header> <col_header> Census </col_header> <col_header> Pop. </col_header> <col_header>  </col_header> <col_header> %± </col_header> </cell> </table>
The 2010 United States Census reported that San Marcos had a population of 83,781.