There are 8 US Post Offices in Rice County serving a total of 10,276 residents equating to 1,285 residents per post office. It's estimated that approximately 16,402 packages are handled across the 8 county post offices annually. Rice County (standard abbreviation: RC) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 10,083. The largest city and county seat is Lyons. The county was named in memory of Samuel Allen Rice, Brigadier-General, United States volunteers, killed April 30, 1864, at Jenkins Ferry, Arkansas."