11th Tamil Nadu Legislative Assembly
● 0 Casual Vacancies Held
100% SPA Majority Retained
Tamil Nadu Assembly By-Elections & Vacancies Archive (1996)
Official Election Commission of India (ECI) certified returns, victory margins, turnout statistics, and constitutional grounds under Section 151A of the RPA 1951 for casual vacancies arising during the 11th Tamil Nadu Legislative Assembly.
Completed Assembly By-Elections & Certified Returns
Statutory results, winner profiles, vote share distributions, and victory margins.
Archival Intelligence (1997 – 2024)
Tamil Nadu Assembly By-Elections Historical Archive
Historical casual vacancies, anti-defection triggers, landmark leadership re-elections, and by-poll trends across seven Legislative Assembly terms.
15th Assembly • 22 Constituencies
15th Assembly By-Elections (2019) • 22 Constituencies
Unprecedented 22 assembly by-elections held following the disqualification of 18 rebel AIADMK MLAs under the Tenth Schedule (Anti-Defection Law) and multiple vacancies.
Outcome
DMK won 13 seats, AIADMK won 9 seats. The victory allowed AIADMK to retain a simple majority in the House (123 seats).
| AC # | Constituency | District | Winning Candidate & Party | Runner-Up Candidate & Party | Victory Margin |
|---|---|---|---|---|---|
| #6 | Poonamallee (SC) | Thiruvallur | A. Krishnaswamy (DMK) | G. Vaithiyanathan (AIADMK) | +60,096 |
| #12 | Perambur | Chennai | R. D. Sekar (DMK) | R. S. Raajesh (AIADMK) | +68,023 |
| #33 | Tiruporur | Chengalpattu | L. Idhayavarman (DMK) | S. Arumugam (AIADMK) | +21,013 |
| #39 | Sholinghur | Ranipet | G. Sampathu (AIADMK) | A. Asokan (DMK) | +16,056 |
| #45 | Gudiyatham (SC) | Vellore | S. Kathavarayan (DMK) | R. Moorthy (AIADMK) | +27,841 |
| #47 | Ambur | Tirupathur | A. C. Vilwanathan (DMK) | J. Jyothi Ramalinga Raja (AIADMK) | +37,767 |
| #54 | Hosur | Krishnagiri | S. A. Sathya (DMK) | S. Jyothi Balakrishna (AIADMK) | +23,213 |
| #60 | Pappireddipatti | Dharmapuri | A. Govindasamy (AIADMK) | A. Mani (DMK) | +18,493 |
| #61 | Harur (SC) | Dharmapuri | V. Sampathkumar (AIADMK) | C. Vaiyapuri (DMK) | +9,394 |
| #131 | Nilakkottai (SC) | Dindigul | S. Thenmozhi (AIADMK) | C. Soundarapandian (DMK) | +20,675 |
| #168 | Tiruvarur | Tiruvarur | K. Poondi Kalaivanan (DMK) | R. Jeevanantham (AIADMK) | +64,571 |
| #174 | Thanjavur | Thanjavur | T. K. G. Neelamegam (DMK) | R. Gandhi (AIADMK) | +39,980 |
| #187 | Manamadurai (SC) | Sivaganga | S. Nagarajan (AIADMK) | Ilakkiyan (DMK) | +8,194 |
| #198 | Andipatti | Theni | A. Maharajan (DMK) | A. Logirajan (AIADMK) | +12,323 |
| #200 | Periyakulam (SC) | Theni | K. S. Saravanakumar (DMK) | M. Mayilvel (AIADMK) | +20,320 |
| #204 | Sattur | Virudhunagar | M. S. R. Rajavarman (AIADMK) | V. Srinivasan (DMK) | +1,101 |
| #209 | Paramakudi (SC) | Ramanathapuram | N. Sadhan Prabhakar (AIADMK) | S. Murugesan (DMK) | +14,032 |
| #214 | Vilathikulam | Thoothukudi | P. Chinnappan (AIADMK) | A. C. Jeyakumar (DMK) | +28,554 |
| #134 | Aravakurichi | Karur | V. Senthil Balaji (DMK) | V. V. Senthilnathan (AIADMK) | +37,957 |
| #190 | Thiruparankundram | Madurai | P. Saravanan (DMK) | S. Muniyandi (AIADMK) | +2,396 |
| #217 | Ottapidaram (SC) | Thoothukudi | C. Shanmugaiah (DMK) | P. Mohan (AIADMK) | +19,657 |
| #118 | Sulur | Coimbatore | V. P. Kandasamy (AIADMK) | Pongalur N. Palanisamy (DMK) | +24,513 |
15th Assembly • J. Jayalalithaa Succession & Deferred Polls
15th Assembly By-Elections (2016 – 2017)
The famous RK Nagar by-election caused by the demise of Chief Minister J. Jayalalithaa, alongside deferred polls in Aravakurichi and Thanjavur.
Dr. Radhakrishnan Nagar (RK Nagar)
21 December 2017
Demise of sitting Chief Minister J. Jayalalithaa on 5 December 2016
Winner: T. T. V. Dhinakaran (Independent - Cooker Symbol)
(89,013 votes, 50.32%)
Runner-Up: E. Madhusudhanan (AIADMK)
Margin: +40,707
Turnout: 77.68%
💡 First Independent MLA to win a Tamil Nadu Assembly by-election in 16 years; led to the formal floating of AMMK.
Aravakurichi
19 November 2016
General election postponed by ECI due to rampant cash-for-votes distribution
Winner: V. Senthil Balaji (AIADMK)
(88,068 votes, %)
Runner-Up: K. C. Palanisamy (DMK)
Margin: +23,661
Turnout: 81.92%
Thanjavur
19 November 2016
General election postponed by ECI
Winner: M. Rengasamy (AIADMK)
(101,362 votes, %)
Runner-Up: Anjugam Boopathi (DMK)
Margin: +26,874
Turnout: 69.83%
Thiruparankundram
19 November 2016
Demise of elected MLA S. M. Seenivel before taking oath
Winner: A. K. Bose (AIADMK)
(91,122 votes, %)
Runner-Up: P. Saravanan (DMK)
Margin: +22,670
Turnout: 70.36%
12th Assembly • Landmark Chief Ministerial Return
12th Assembly By-Elections (2002 – 2003) • Jayalalithaa Return to Power
Crucial constitutional by-polls that enabled J. Jayalalithaa to enter the Assembly and reassume the office of Chief Minister.
Andipatti
21 February 2002
Resignation of sitting MLA Thanga Tamil Selvan (AIADMK) to vacate seat for J. Jayalalithaa following her acquittal by the Madras High Court in TANSI land deal
Winner: J. Jayalalithaa (AIADMK) (78,437 votes)
Runner-Up: Vaigai Sekar (DMK)
Margin: +41,201 votes
🏛️ Paved the way for Jayalalithaa to take oath as Chief Minister of Tamil Nadu on 2 March 2002, succeeding interim CM O. Panneerselvam.
Saidapet
31 May 2002
Demise of DMK MLA V. P. Duraisamy
Winner: Radha Ravi (AIADMK)
Runner-Up: M. Subramanian (DMK)
Margin: +11,002 votes
Sathankulam
26 February 2003
Demise of Congress MLA S. S. Mani Nadar
Winner: L. Neelamegavarnam (AIADMK)
Runner-Up: A. Mahendran (INC)
Margin: +17,438 votes
13th Assembly • 8 Constituencies
13th Assembly By-Elections (2009 – 2010) • 8 Constituencies
| Seat | Date | Winner | Margin |
|---|---|---|---|
| Bargur | 18 Aug 2009 | K. R. K. Narasimhan (DMK) | +37,303 |
| Cumbum | 18 Aug 2009 | N. Ramakrishnan (DMK) | +39,573 |
| Ilayangudi | 18 Aug 2009 | Suba Mathiarasan (DMK) | +42,449 |
| Srivaikuntam | 18 Aug 2009 | M. B. Sudalaiyandi (INC) | +21,136 |
| Thondamuthur | 18 Aug 2009 | M. N. Kandaswamy (INC) | +71,703 |
| Tiruchendur | 19 Dec 2009 | Anitha R. Radhakrishnan (DMK) | +46,861 |
| Vandavasi (SC) | 19 Dec 2009 | Kamalakannan (DMK) | +38,011 |
| Pennagaram | 27 Mar 2010 | P. N. P. Inbasekaran (DMK) | +36,048 |
11th & 13th Assemblies Historical Battles
Southern TN & Historic Terms
| Seat | Date | Winner | Margin |
|---|---|---|---|
| Madurai Central | 11 Oct 2006 | S. Syed Ghouse Basha (DMK) | +31,085 |
| Madurai West | 26 June 2007 | K. S. K. Rajendran (AIADMK) | +31,115 |
| Aruppukkottai | 22 February 1998 | Thamarai Kani (AIADMK) | +3,200 |
| Coonoor (SC) | 22 February 1998 | M. Ranganathan (DMK) | +18,450 |
| Nellikkuppam | 17 February 2000 | V. C. Shanmugam (DMK) | +12,450 |
| Tiruchirappalli II | 17 February 2000 | Anbil Periyasamy (DMK) | +14,120 |