Wallace County (standard abbreviation: WA) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 1,485, making it the second-least populous county in Kansas. Its county seat is Sharon Springs. The county was created in 1868 and named in honor of Brigadier general W.H.L. Wallace who was a veteran of the Mexican-American War and a casualty of the Battle of Shiloh.