|Time zone||IST (UTC+5:30)|
Usilampatti is located at Madurai District at  It has an average elevation of 201 metres (659 feet)..
According to 2011 census, Usilampatti had a population of 35,219 with a sex-ratio of 998 females for every 1,000 males, much above the national average of 929. A total of 3,427 were under the age of six, constituting 1,800 males and 1,627 females. Scheduled Castes and Scheduled Tribes accounted for 7.94% and .01% of the population respectively. The average literacy of the town was 78.39%, compared to the national average of 72.99%. The town had a total of : 9101 households. There were a total of 13,031 workers, comprising 443 cultivators, 1,113 main agricultural labourers, 417 in house hold industries, 9,892 other workers, 1,166 marginal workers, 32 marginal cultivators, 343 marginal agricultural labourers, 76 marginal workers in household industries and 715 other marginal workers.
As per the religious census of 2011, Usilampatti had 94.53% Hindus, 2.33% Muslims, 2.91% Christians, 0.02% Sikhs, 0.19% following other religions and 0.01% following no religion or did not indicate any religious preference.
Usilampatti assembly constituency is part of theni (Lok Sabha constituency).
- Falling Rain Genomics, Inc - Usilampatti
- "Census Info 2011 Final population totals". Office of The Registrar General and Census Commissioner, Ministry of Home Affairs, Government of India. 2013. Retrieved 26 January 2014.
- "Census Info 2011 Final population totals - Usilampatti". Office of The Registrar General and Census Commissioner, Ministry of Home Affairs, Government of India. 2013. Retrieved 26 January 2014.
- "Population By Religious Community - Tamil Nadu" (XLS). Office of The Registrar General and Census Commissioner, Ministry of Home Affairs, Government of India. 2011. Retrieved 13 September 2015.