The minor district (king amphoe) Wan Yai was created on 16 September 1977, when the tambon Wan Yai, Pong Kham, and Bang Sai Noi were split off from Mukdahan district.[1] In 1982 it was one of six districts which formed the new province of Mukdahan. The minor district was upgraded to a full district on 9 May 1992.[2]
Administration
The district is divided into five sub-districts (tambon), which are further subdivided into 44 villages (muban). There are no municipal (thesaban) areas, and four tambon administrative organization (TAO).