Sedan is the county seat of and the largest city in Chautauqua County, Kansas, United States. As of the 2010 census, the city population was 1,124.
Sedan is located at 37°7′42″N 96°11′10″W / 37.12833°N 96.18611°W / 37.12833; -96.18611 (37.128472, -96.186220). According to the United States Census Bureau, the city has a total area of 0.8 square miles (2.0 km²), all of it land.
Sedan's population was estimated to be 1,222 in the year 2006, a decrease of 117, or -8.7%, over the previous six years.