Nannilam is a Town and Taluk in Thiruvarur District in the Indian state of Tamil Nadu.

The town is a main hub for the nearby villages.

The Tirumalarajanar River (a branch of Kaveri) flows in Nannilam taluk.

[citation needed] According to the 2001 Indian census,[1] Nannilam then had a population of 9880.

[2] The Population density (people per km2) of Nannilam assembly constituency is just 60 against India's 393.83 in 2010 (Just 15% of average India's Population density).