There are 11 US Post Offices in Reno County serving a total of 37,396 residents equating to 3,400 residents per post office. It's estimated that approximately 59,688 packages are handled across the 11 county post offices annually. Reno County (standard abbreviation: RN) is a county located in the U.S. state of Kansas. As of the 2010 census, the population was 64,511. The largest city and county seat is Hutchinson."