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- Number of Registered Factories and Workers in Thiruvallur District of Tamil Nadu (Upto 31.03.2010)
- Number of Factories, Capital Invested and Number of Persons Employed in (Rural/Urban) District of Tamil Nadu (2009-2010)
- Number of Registered Factories and Workers in Thiruvallur District of Tamil Nadu (As on 31.12.2009)
- Number of Factories, Capital Invested and Number of Persons Employed in Thiruvallur District of Tamil Nadu (2008-2009)
- Number of Registered Factories, Working Factories and Average Workers in Thiruvallur District of Tamil Nadu (2006 and 2007)
- Number of Factories, Capital Invested and Number of Persons Employed in Thiruvallur District of Tamil Nadu (As on March, 2005)