|Time zone||UTC+5:30 (IST)|
According to 2011 census, Nelliyalam had a population of 44,590 with a sex-ratio of 1,035 females for every 1,000 males, much above the national average of 929. A total of 4,717 were under the age of six, constituting 2,371 males and 2,346 females. Scheduled Castes and Scheduled Tribes accounted for 58.49% and 4.% of the population respectively. The average literacy of the town was 77.99%, compared to the national average of 72.99%. The town had a total of 10729 households. There were a total of 19,320 workers, comprising 101 cultivators, 1,565 main agricultural labourers, 61 in house hold industries, 14,972 other workers, 2,621 marginal workers, 7 marginal cultivators, 367 marginal agricultural labourers, 22 marginal workers in household industries and 2,225 other marginal workers. As per the religious census of 2011, Nelliyalam had 79.85% Hindus, 14.42% Muslims, 5.69% Christians, 0.02% Sikhs and 0.03% following other religions.
- "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 - Nelliyalam". 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.
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