<page_title> Clay County, Iowa </page_title> <section_title> Demographics </section_title> <table> <cell> 2000 <col_header> Historical population </col_header> <col_header> Census </col_header> </cell> <cell> 17,372 <col_header> Historical population </col_header> <col_header> Pop. </col_header> </cell> </table>
As of the census of 2000, there were 17,372 people, residing in the county.