The Divisional Council of De Aar was constituted on 25 January 1919 under provision of Proclamation No 25 of 1919 in terms of Ordinance No 13 of 1917 (The Province of the Cape of Good Hope Official Gazette No 607, 7 February 1919). The first meeting of the Council was held on 15 November 1919.

On 1 January 1980 the Divisional Council of De Aar was reconstituted together with the Divisional Councils of Hanover and Philipstown to form the new Divisional Council of Bo-Karoo (The Province of the Cape of Good Hope Official Gazette No 4061, 20 July 1979, Proclamation No 174, 18 July 1979).