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In the first phase, TMC lost a seat to AIADMK and Dravida Munnetra Kazhagam (DMK) lost a seat to Communist Party of India (Marxist) (CPI (M)). In the second phase, AIADMK splinter party MADMK, was able to pick up a seat from AIADMK and DMK was able to hold on to its seats.
The number on the left, in the table, represents the total number of MLAs after the by-election, and the number in parentheses represents the seats picked up or lost due to the by-election
The numbers presented for 1996, represents, the alliance, when the TMC and the left allied with the DMK.
Constituents and results
Source: Election Commission of India
Natham
Tamil Nadu assembly by-election, 1999/2000: Natham
"Archived copy" (PDF). Archived from the original (PDF) on 5 January 2011. Retrieved 24 December 2009.{{cite web}}: CS1 maint: archived copy as title (link)