There are 5 US Post Offices in Ellsworth County serving a total of 6,098 residents equating to 1,220 residents per post office. It's estimated that approximately 9,733 packages are handled across the 5 county post offices annually. Ellsworth County (county code EW) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 6,497. Its county seat and most populous city is Ellsworth."