<page_title> Keystone, Iowa </page_title> <section_title> Demographics </section_title> <table> <cell> 2010 <col_header> Historical populations </col_header> <col_header> Year </col_header> <col_header> 1900 </col_header> <col_header> 1910 </col_header> <col_header> 1920 </col_header> <col_header> 1930 </col_header> <col_header> 1940 </col_header> <col_header> 1950 </col_header> <col_header> 1960 </col_header> <col_header> 1970 </col_header> <col_header> 1980 </col_header> <col_header> 1990 </col_header> <col_header> 2000 </col_header> </cell> <cell> 622 <col_header> Historical populations </col_header> <col_header> Pop. </col_header> <row_header> 2010 </row_header> </cell> </table>
As of the census of 2010, there were 622 people residing in Keystone, Iowa.