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2009 By-elections
Tamil Nadu
8 seats contested
By-elections held in Tamil Nadu during 2009 — 8 seats were contested, not the full assembly. Results are shown as a table: a map of a handful of seats would leave the rest of the state blank, which reads as "no result" rather than "not contested". Seat shares below are of the seats contested here, not of the assembly.
Seats won by party
| # | Constituency | Winner | Party | Votes | Share | Margin | Turnout |
|---|---|---|---|---|---|---|---|
| 51 | Vandavasi | J. Kamalakanna |  DMK | 78,827 | 59.4% | 38,017 | — |
| 78 | Bargur | Narasiman K.R.K | DMK | 89,481 | 68.3% | 59,103 | — |
| 103 | Thondamuthur | Kandaswamy M.N |  INC | 1,12,350 | 55.7% | 71,487 | — |
| 134 | Cumbum | Ramakrishan N, | DMK | 81,515 | 72.7% | 57,373 | — |
| 137 | Thirumangalam | L.Athiyaman | DMK | 79,422 | 57.5% | 39,266 | — |
| 197 | Ilayangudi | Mathi Arasan S | DMKO | 61,084 | 72.0% | 41,456 | — |
| 225 | Tiruchendur | Anitha R. R. | DMK | 75,223 | 67.8% | 46,861 | — |
| 226 | Srivaikuntam | M.B. Sudalaiyandi | INC | 53,827 | 63.7% | 31,359 | — |
Election data: ECI