Population Note: The population as per 2011 census calculated basis pre-expansion city area of 174 sq.km. was 4,646,732.[7] Post expansion of city limits to 426 sq.km.,[4] the population including the new city limits was provided by Government of Tamil Nadu was 6,748,026.[9] The 2011 census data for the urban agglomeration is available and has been provided.[7] Chennai (/ˈtʃɛnaɪ/ ⓘ, Tamil: [ˈt͡ɕen