<page_title> List of states and territories of the United States by population </page_title> <section_title> State rankings </section_title> <table> <cell> 21 <col_header> Rank in the fifty states, 2018 </col_header> </cell> <cell> Colorado <col_header> Name </col_header> </cell> </table>
Colorado is the 21st most populous U.S. state.