 Later, Sai Mun was given "tambon" status, and in 1968, Sanitary District ("khet sukhaphiban") Sai Mun was created.After the separation of Yasothon from Ubon in 1972, on 15 May 1975, Sai Mun was elevated to a minor district ("king amphoe"), taking four "tambons" from Mueang Yasothon District