Tamil Nadu 2026 · By-elections

Madurantakam and Dharapuram, October 2026

Two seats, both won by the AIADMK in May, both vacated when the MLAs moved to TVK. Here is how the bypolls compare with the May 2026 general election and with 2021.

Source: ECI results portal, saved through the count · May 2026 = the general election (polled 23 April, counted 4 May) · Read the analysis

Section 1 · Results

Both seats, both defectors

Winner, margin and runner-up in each seat, with the same seat's winner in 2021 and May 2026. Margins are shown in votes and as a share of all votes polled, NOTA included.

Section 2 · Three elections

2021, May 2026 and the October bypoll

Vote share by party in each seat across all three elections. Toggle between shares and raw votes. In 2021 the AIADMK left Dharapuram to its NDA ally, the BJP; TVK did not exist yet.

Section 3 · Round by round

How the count went

Each party's share of the votes counted so far, after every EVM round, from the ECI pages saved during the count. Madurantakam was never close; in Dharapuram the AIADMK led the first four rounds.

Round by round

Section 4 · Turnout

Fewer voters than in May

Turnout and total votes polled in each election. Bypoll and May turnout figures are the ECI's polling-day numbers as reported in the press; 2021 is from the ECI data published by OpenCity.

Section 5 · Every candidate

All 49 candidates

The full October ballot in each seat, with EVM and postal votes. Independents who share a main candidate's name (ignoring initials) are flagged.

Section 6 · Where

The two seats on the map

Madurantakam is in Chengalpattu district, south of Chennai; Dharapuram is in Tiruppur district in the Kongu belt. Both are reserved for Scheduled Castes.

Section 7 · Still vacant

The seats still waiting for a bypoll

Assembly seats vacant after October 9, with the May 2026 result in each. No poll dates have been announced.

Keep reading

More on TN 2026

The analysisTwo AIADMK defectors won their seats back on TVK's ticketDid the vote follow the MLA? The swing, the count and what it does and does not show. Results pageMadurantakam by-election resultEvery candidate, the count round by round, and the 2021 and May comparison. Results pageDharapuram by-election resultEvery candidate, the count round by round, and the 2021 and May comparison. HubTN 2026 bypollsKey numbers, the comparison tables and the vacant-seat tracker on one page. May 2026TN 2026 ExplorerEvery seat from the general election: map, swing, regional anatomy, every candidate. Seat pageMadurantakam, May 2026The general-election result in full. Seat pageDharapuram, May 2026The general-election result in full.