 The district was created as a minor district ("king amphoe") on 1 April 1984, when the three "tambons" Bang Khan, Ban Lamnao, and Wang Hin were split off from Thung Song District.On 9 April 1992 the minor district was upgraded to a full district.The district is divided into four sub-districts ("tambons"), which are further subdivided into 60 villages ("mubans").