Administrative divisions of Chennai

Prior to its expansion in late 2011, the city occupied an area of 174 km2 (67 sq mi); its merger with 42 local bodies at that time more than doubled its extent, resulting in a combined area of 426 km2 (164 sq mi).

[4] A total of nine municipalities merged into the city: Alandur, Ambattur, Kattivakkam, Madhavaram, Maduravoyal, Manali, Tiruvottiyur, Ullagaram-Puzhuthivakkam and Valasaravakkam.

A total of eight town panchayats merged into the city: Chinnasekkadu, Puzhal, Porur, Nandambakkam, Meenambakkam, Perungudi, Pallikaranai, Sholinganallur.

A total of twenty-five village panchayats merged into the city: Edayanchavadi, Sadayankuppam, Kadapakkam, Theeyampakkam, Mathur, Vadaperumbakkam, Surapet, Kathirvedu, Puthagaram, Nolambur, Karambakkam, Nerkundram, Ramapuram, Mugalivakkam, Manapakkam, Kottivakkam, Palavakkam, Neelankarai, Injambakkam, Karapakkam, Okkiyam-Thuraipakkam, Madipakkam, Jaladampet, Semmencherry, and Uthandi.

[4] The expanded city contains 4.41 million voters and was re-organised into 15 zones consisting of 200 wards.