Chennai
- Website of the local administration. Includes maps, information on history, departments, and on tourism.
- http://www.chennai.tn.nic.in/

Chennai Telephones
- The website of the metropolitan telephone company, a government undertaking.
- http://chennai.bsnl.co.in

Chennai Metropolitan Water Supply and Sewerage Board
- CMWSSB website describes service standards, phone numbers, administration details, user facilities.
- http://www.chennaimetrowater.com/

Chennai Customs
- Information about the organisation, for travellers, about cargo, and relevant legislation.
- http://www.chennaicustoms.org/

Chennai Central Excise
- Official web site of Central Excise Commissionerates at Chennai. Contains FAQs, notifications.
- http://kalalchennai.tn.nic.in