· Dindigul
Dindigul district was carved out of Madurai district in September 1985.
Dindigul had been the capital of a district under early Company rule before it was merged into Madurai. In September 1985 Dindigul district was re-established from Madurai district. It covered the Palani hills, including Kodaikanal, and the temple town of Palani. Dindigul town became its headquarters.
AIADMK wins the Dindigul Lok Sabha by-election
K. Maya Thevar won the Dindigul by-election, giving the newly formed AIADMK its first electoral victory.
Periyar (Erode) district formed
Erode district, first named Periyar district, was carved out of Coimbatore district.
Coimbatore becomes a municipal corporation
Coimbatore, a municipality since 1866, was raised to municipal corporation status, becoming the third such body in Tamil Nadu.
Ramanathapuram district split into three
Ramanathapuram district was trifurcated into Ramanathapuram, Sivaganga and Virudhunagar districts.
Thoothukudi (Tuticorin) district was carved out of Tirunelveli district on 20 October 1986.
North Arcot district split into Vellore and Tiruvannamalai
North Arcot was divided into the Tiruvannamalai Sambuvarayar and North Arcot Ambedkar districts.
