As per the 2011 Census of India, Tamil Nadu had a population of 72,147,039, an increase from 62.4 million in 2001. There were 36,137,975 males and 36,009,064 females, with a sex ratio of 996 females per 1000 males. Its literacy rate was 80.09%, and about 10.51% of the population was below seven years old. It had a population density of 555 inhabitants per km<sup>2</sup>. The state had a workforce of 27,878,282 (44.67%).
The following table shows the distributions of male and female populations of Tamil Nadu's districts, as of 2011:
The following tables show the distribution of religious followers in Tamil Nadu, by number and percentage.