There are 5 US Post Offices in Elk County serving a total of 2,742 residents equating to 548 residents per post office. It's estimated that approximately 4,377 packages are handled across the 5 county post offices annually. Elk County (county code EK) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 2,882. Its county seat and most populous city is Howard.