Chennai city has three lakh more people living in it now than it had in 2001.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/chennais-population-78-percent
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chennai-d
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/population
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/people
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thiruvallur-d
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kanchipuram-d