<page_title> List of U.S. counties with longest life expectancy </page_title> <section_title> Top 51 counties in 2014 </section_title> <table> <cell> 1. Summit County, Colorado <col_header> County and state </col_header> </cell> <cell> 86.83 <col_header> 2014 life expectancy (years) </col_header> </cell> </table>
The residents of Summit County, Colorado, live the longest with an average life expectancy of 86.83 years.