Here we find out the Population density of each district in Tamil Nadu based on the Census data of the year 2011.
| Sino | District | Area in Sq. Km | Population | Density / Sq. Km |
| 1 | Ariyalur | 2028 | 754,894 | 372 |
| 2 | Chengalpet | 2803 | 2,556,244 | 912 |
| 3 | Chennai | 462 | 4,646,732 | 10,058 |
| 4 | Coimbatore | 4951 | 3,458,045 | 698 |
| 5 | Cuddalore | 3870 | 2,605,914 | 673 |
| 6 | Dharmapuri | 4736 | 1,506,843 | 318 |
| 7 | Dindigul | 6289 | 2,159,775 | 343 |
| 8 | Erode | 6036 | 2,251,744 | 373 |
| 9 | Kallakurichi | 3441 | 1,370,281 | 398 |
| 10 | Kancheepuram | 1800 | 1,166,401 | 648 |
| 11 | Karur | 3022 | 1,064,493 | 352 |
| 12 | Krishnagiri | 5414 | 1,883,731 | 348 |
| 13 | Madurai | 3846 | 3,038,252 | 790 |
| 14 | Mayiladuthurai | 1237 | 85,632 | 69 |
| 15 | Nagapattinam | 1459 | 1,616,450 | 1,108 |
| 16 | Kanyakumari | 1729 | 1,870,374 | 1,082 |
| 17 | Namakkal | 3573 | 1,726,601 | 483 |
| 18 | Perambalur | 1837 | 565,223 | 308 |
| 19 | Pudukottai | 4848 | 1,618,345 | 334 |
| 20 | Ramanathapuram | 4243 | 1,353,445 | 319 |
| 21 | Ranipet | 2234 | 1,210,277 | 542 |
| 22 | Salem | 5205 | 3,482,056 | 669 |
| 23 | Sivagangai | 4086 | 1,339,101 | 328 |
| 24 | Tenkasi | 2916 | 1,407,627 | 483 |
| 25 | Thanjavur | 3397 | 2,405,890 | 708 |
| 26 | Theni | 3066 | 1,245,899 | 406 |
| 27 | Thiruvallur | 3444 | 3,728,104 | 1,082 |
| 28 | Thiruvarur | 2161 | 1,264,277 | 585 |
| 29 | Tuticorin | 4621 | 1,750,176 | 379 |
| 30 | Trichirappalli | 4407 | 2,722,290 | 618 |
| 31 | Thirunelveli | 3842 | 1,665,253 | 433 |
| 32 | Tirupathur | 1793 | 1,111,812 | 620 |
| 33 | Tiruppur | 5186 | 2,479,052 | 478 |
| 34 | Tiruvannamalai | 6191 | 2,464,875 | 398 |
| 35 | The Nilgiris | 2453 | 735,394 | 300 |
| 36 | Vellore | 2222 | 1,614,242 | 726 |
| 37 | Viluppuram | 3726 | 2,093,003 | 562 |
| 38 | Virudhunagar | 4288 | 1,942,288 | 453 |