There are 3 US Post Offices in Ellis County serving a total of 28,162 residents equating to 9,387 residents per post office. It's estimated that approximately 44,950 packages are handled across the 3 county post offices annually. Ellis County (county code EL) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 28,452. Its county seat and most populous city is Hays. Ellis County is the official German Capital of Kansas. German immigrants settled in Hays, Ellis, Victoria, and nearby villages in the 1870s and 1880s."