 The minor district ("king amphoe") was created on 7 January 1986, when the four "tambons", Nam Kliang, La-o, Tong Pit, and Khoen, were split off from Kanthararom District.It was upgraded to a full district on 4 July 1994.The district is divided into six sub-districts ("tambons"), which are further subdivided into 75 villages ("mubans").