The present Dharmapuri was a part of the Salem District. The Dharmapuri district was formed as a separate district on 02-10-1965 with its headquarters at Dharmapuri. Thiru G.Thirumal I.A.S was the first collector of Dharmapuri District. The Dharmapuri District was bifurcated into Dharmapuri and Krishnagiri district on 09-02-2004. The Tamil Nadu Government announced the yearly financial budget for 2007-2008 to open a DIET in Dharmapuri District , G.O.Ms.No.145 of Tamilnadu Government.
The DIET was established on 02.09.2007 and temporarily working in the premise of the Government Higher Secondary School, Pulikkarai, Palacode Taluk, 12 Km away from Dharmapuri town on the way to Hosur main road via Palacode. Following are the branches of the DIET are functioning in the existing DIETs. Other than pre-service all other branches are functioning in Dharmapuri district.