Finding 4 — TVK's strongest gains were Chennai metropolitan
9 of the top-10 TVK-gain ACs are in Chennai + Thiruvallur districts. Suburban Chennai metro went TVK at +50-59 pp.
The 10 ACs where TVK gained most
| Rank | AC | District | TVK swing | DMK swing | AIADMK swing |
|---|---|---|---|---|---|
| 1 | Perambur | Chennai | +58.9 | −19.9 | −25.1 |
| 2 | Dr.Radhakrishnan Nagar | Chennai | +54.0 | −24.6 | −13.7 |
| 3 | Thiruvottiyur | Thiruvallur | +53.2 | −44.1 | −11.6 |
| 4 | Madavaram | Thiruvallur | +52.6 | −23.7 | −14.8 |
| 5 | Poonamallee | Thiruvallur | +52.2 | −28.1 | — |
| 6 | Avadi | Thiruvallur | +52.1 | −19.9 | −31.6 |
| 7 | Tirupattur | Tirupathur | +51.8 | −23.9 | — |
| 8 | Salem (West) | Salem | +51.4 | −38.8 | — |
| 9 | Ambattur | Thiruvallur | +51.3 | −19.0 | −30.1 |
| 10 | Velachery | Chennai | +43.5 | (very high loss) | −10.8 |
8 of these 10 ACs are in just two districts — Chennai (3) and Thiruvallur (5). Two more (Tirupattur, Salem) are in industrial-suburban belts.
Why this geographic concentration
Chennai metro + its suburban belt represents urban, mobile, dual-income, younger demographics. Plausible drivers:
- Younger median voter age in urban Chennai metro — TVK leader Vijay's fanbase skews young.
- Higher cinema-affinity — Vijay has 30+ years of urban Tamil cinema presence; Chennai is his cultural home market.
- Lower party-loyalty — urban voters in established metros tend to be more swing-prone than rural strongholds.
- Less alliance-machine dependence — the established DMK/AIADMK ground game leans rural. Urban ACs are more reachable via direct media.
This analysis can't quantify which driver matters most — that would require either booth-level data (urban vs suburban sub-AC variation) or demographic crosstabs we don't have (age, occupation).
What the geography tells us about the wave
TVK's median gain across all 234 ACs was +33.7 pp. The top-10 ACs are 50-60 pp — significantly higher than median. So:
- The wave was broad (+34 pp median, present everywhere)
- And the wave had a peak (+50-59 pp in Chennai metro)
This is consistent with "national party meets metro home turf" — a baseline shift everywhere, amplified where the candidate-by-cinema brand was strongest.
The opposite question — where did TVK gain least?
| Rank from bottom | AC | District | TVK swing |
|---|---|---|---|
| 1 | Edappadi | Salem | (none — no 2021 baseline join, AC reorg) |
| 2 | (multiple new-district ACs in TN's south) | — | swing data thin |
The bottom of the swing table is dominated by ACs in post-2011 new districts (Tirupathur, Mayiladuthurai, Kallakurichi, Tenkasi, Ranipet, Chengalpattu) where 2021↔2026 join issues create artefacts. The clean ACs at the bottom of the TVK gain list are mostly rural southern TN (Thoothukudi, Tirunelveli interior, Kanniyakumari).
That maps to the inverse of the metro story — TVK gained less where alliances had deep rural roots.
A map would help
We have AC polygons (DataMeet shapefile, s3://tnelection2026/geo/curated/year=2026/ac_polygons.parquet) but this site doesn't render a choropleth yet. The geo data is in WKT format, ready for a Folium / Mapbox visualisation in a follow-up.
Method note
- "Top 10 TVK gain" is sorted by TVK swing descending, filtered to ACs with a clean 2021 join.
- District names come from the 2021 results dataset; the post-2011 new districts (Tirupathur, Chengalpattu, etc.) are honestly under-covered in religion data and partially in the join itself.
- Edappadi (rank 1 by alphabetic sort) showed up at the top of the original output because AC reorganisation 2021 → 2026 invalidated its 2021 join. Excluded from the substantive top-10 above.