There are 6 US Post Offices in Kingman County serving a total of 6,517 residents equating to 1,086 residents per post office. It's estimated that approximately 10,402 packages are handled across the 6 county post offices annually. Kingman County (standard abbreviation: KM) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 7,858. The largest city and county seat is Kingman."