Demographics of Tamil Nadu
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 km2. The state had a workforce of 27,878,282.
The following table shows the distributions of male and female populations of Tamil Nadu's districts, as of 2011:
| District | Total | Male | % | Female | % | Notes |
| Ariyalur | 754,894 | 374,703 | 49.6 | 380,191 | 50.4 | |
| Chennai | 4,646,732 | 2,335,844 | 50.3 | 2,310,888 | 49.7 | |
| Coimbatore | 3,458,045 | 1,729,297 | 50.0 | 1,728,748 | 50.0 | |
| Cuddalore | 2,605,914 | 1,311,697 | 50.3 | 1,294,217 | 49.7 | |
| Dharmapuri | 1,506,843 | 774,303 | 51.4 | 732,540 | 48.6 | |
| Dindigul | 2,159,775 | 1,080,938 | 50.0 | 1,078,837 | 50.0 | |
| Erode | 2,251,744 | 1,129,868 | 50.2 | 1,121,876 | 49.8 | |
| Kancheepuram | 3,998,252 | 2,012,958 | 50.3 | 1,985,294 | 49.7 | |
| Kanniyakumari | 1,870,374 | 926,345 | 49.5 | 944,029 | 50.5 | |
| Karur | 1,064,493 | 528,184 | 49.6 | 536,309 | 50.4 | |
| Krishnagiri | 1,879,809 | 960,232 | 51.1 | 919,577 | 48.9 | |
| Madurai | 3,038,252 | 1,526,475 | 50.2 | 1,511,777 | 49.8 | |
| Nagapattinam | 1,616,450 | 798,127 | 49.4 | 818,323 | 50.6 | |
| Namakkal | 1,726,601 | 869,280 | 50.3 | 857,321 | 49.7 | |
| Perambalur | 565,223 | 282,157 | 49.9 | 283,066 | 50.1 | |
| Pudukkottai | 1,618,345 | 803,188 | 49.6 | 815,157 | 50.4 | |
| Ramanathapuram | 1,353,445 | 682,658 | 50.4 | 670,787 | 49.6 | |
| Salem | 3,482,056 | 1,781,571 | 51.2 | 1,700,485 | 48.8 | |
| Sivaganga | 1,339,101 | 668,672 | 49.9 | 670,429 | 50.1 | |
| Thanjavur | 2,405,890 | 1,182,416 | 49.1 | 1,223,474 | 50.9 | |
| The Nilgiris | 735,394 | 360,143 | 49.0 | 375,251 | 51.0 | |
| Theni | 1,245,899 | 625,683 | 50.2 | 620,216 | 49.8 | |
| Thiruvallur | 3,728,104 | 1,876,062 | 50.3 | 1,852,042 | 49.7 | |
| Thiruvarur | 1,264,277 | 626,693 | 49.6 | 637,584 | 50.4 | |
| Thoothukudi | 1,750,176 | 865,021 | 49.4 | 885,155 | 50.6 | |
| Tiruchirappalli | 2,722,290 | 1,352,284 | 49.7 | 1,370,006 | 50.3 | |
| Tirunelveli | 3,077,233 | 1,520,912 | 49.4 | 1,556,321 | 50.6 | |
| Tiruppur | 2,479,052 | 1,246,159 | 50.3 | 1,232,893 | 49.7 | |
| Tiruvannamalai | 2,464,875 | 1,235,889 | 50.1 | 1,228,986 | 49.9 | |
| Vellore | 3,936,331 | 1,961,688 | 49.8 | 1,974,643 | 50.2 | |
| Viluppuram | 3,458,873 | 1,740,819 | 50.3 | 1,718,054 | 49.7 | |
| Virudhunagar | 1,942,288 | 967,709 | 49.8 | 974,579 | 50.2 | |
| Total | 72,147,030 | 36,137,975 | 50.1 | 36,009,055 | 49.9 | |
The following tables show the distribution of religious followers in Tamil Nadu, by number and percentage.
| Religion | 2001 | 2011 |
| Hinduism | 54,985,079 | 63,188,168 |
| Christianity | 3,785,060 | 4,418,331 |
| Islam | 3,470,647 | 4,229,479 |
| Jainism | 83,359 | 89,265 |
| Sikhism | 9,545 | 14,601 |
| Buddhism | 5,393 | 11,186 |
| Other | 7,252 | 7,414 |
| Not stated | n/a | 188,586 |
| Total | 62,405,679 | 72,147,030 |
| Religion | 2001 | 2011 |
| Hinduism | 88.11 | 87.58 |
| Christianity | 6.06 | 6.12 |
| Islam | 5.56 | 5.86 |
| Jainism | 0.13 | 0.12 |
| Sikhism | 0.01 | 0.02 |
| Buddhism | >0.01 | 0.01 |
| Other | 0.01 | 0.01 |
| Not stated | n/a | 0.26 |