Wallace County (standard abbreviation: WA) is a county in the U.S. state of Kansas. In 2010 census, 1,485 people lived there. This would make it the county in Kansas with the second-least number of people living in it. Its county seat is Sharon Springs. The county was created in 1868. It was named after Brigadier general W.H.L. Wallace, who was a veteran of the Mexican–American War and a casualty of the Battle of Shiloh.