Chautauqua County (county code CQ) is a county in Southeast Kansas. In 2010, 3,669 people lived there. Its county seat is Sedan. Sedan is also the biggest city in Chautauqua County. Chautauqua County is named after Chautauqua County, New York, where Edward Jaquins was born. Jaquins was a Kansas politician who was important in getting the county created.