Shawnee County (county code SN) is a county in northeast Kansas, in the central United States. As of the 2010 census, the population was 177,934 making it the third-most populous county in Kansas.
Its most populous city, Topeka, is the state capital and county seat. The county was one of the original 33 counties created by the first territorial legislature in 1855.
It was named for the Shawnee tribe of Native Americans.