There are 6 US Post Offices in Cloud County serving a total of 9,737 residents equating to 1,623 residents per post office. It's estimated that approximately 15,541 packages are handled across the 6 county post offices annually. Cloud County (county code CD) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 9,533. Its county seat and most populous city is Concordia."