<page_title> Johnstown, Pennsylvania </page_title> <section_title> Demographics </section_title> <table> <cell> 2010 <col_header> Historical population </col_header> <col_header> Census </col_header> </cell> <cell> 20,978 <col_header> Historical population </col_header> <col_header> Pop. </col_header> </cell> </table>
The population was 20,978 as of the 2010 census.