There are 3 US Post Offices in Comanche County serving a total of 1,930 residents equating to 643 residents per post office. It's estimated that approximately 3,080 packages are handled across the 3 county post offices annually. Comanche County (county code CM) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 1,891. Its county seat and most populous city is Coldwater. The county is named after the Comanche Native Americans."