<page_title> Jefferson County, Kansas </page_title> <section_title> Demographics </section_title> <table> <cell> 2000 <col_header> Historical population </col_header> <col_header> Census </col_header> </cell> <cell> 18,426 <col_header> Historical population </col_header> <col_header> Pop. </col_header> </cell> </table>
At the 2000 Census, there were 18,426 people residing in Jefferson County.