Dharapuram, Kangeyam and parts of Perundurai taluks of Erode district. On 5 January 2018, Chennai district altered its borders with increase in area by the annexation of Madhavaram, Maduravoyal, Ambattur, Tiruvottriyur taluks and parts of Ponneri taluk of Tiruvallur and Alandur and Sholinganallur taluks of Kanchipuram (present day Chengalpattu) districts. On 22 November 2019, Tenkasi district was bifurcated from the erstwhile Tirunelveli district comprising Tenkasi, Sengottai, Kadayanallur, Sivagiri, Veerakeralampudur, Sankarankovil, Thiruvenkatam and Alangulam taluks. On 26 November 2019, Kallakurichi district was bifurcated from the erstwhile Viluppuram district comprising Kallakurichi, Sankarapuram, Chinnasalem, Ulundurpet, Thirukovilur and Kalvarayanmalai taluks. On 29 November 2019, Tirupattur and Ranipet districts were trifurcated from the erstwhile Vellore district with Tirupattur district comprising Tirupattur, Vaniyambadi, Natrampalli and Ambur taluks and Ranipet district comprising Walajah, Arcot, Nemili and Arakkonam taluks. On 30 November 2019, Chengalpattu district was bifurcated from the erstwhile Kanchipuram district comprising Tirukalukundram, Chengalpattu, Madurantakam, Cheyyar, Tiruporur, Tambaram, Pallavaram, and Vandalur taluks. On 24 March 2020, Mayiladuthurai district was bifurcated from the erstwhile Nagapattinam district comprising Mayiladuthurai, Sirkazhi, Tharangambadi and Kuthalam taluks. List Former districts See also List of developmental administrative units of Tamil Nadu List of revenue divisions of Tamil Nadu List of districts in Tamil Nadu by Human Development Index List of constituencies of the Tamil Nadu Legislative Assembly List of constituencies of the Lok Sabha in Tamil Nadu References Tamil Nadu Districts Taluks of Tamil Nadu