According to 2011 census, Sivaganga had a population of 40,403 with a sex-ratio of 990 females for every 1,000 males, much above the national average of 929. A total of 3,880 were under the age of six, constituting 1,985 males and 1,895 females. Scheduled Castes and Scheduled Tribes accounted for 9.59% and .07% of the population respectively. The average literacy of the town was 83.86%, compared to the national average of 72.99%. The town had a total of 10184 households. There were a total of 14,145 workers, comprising 164 cultivators, 294 main agricultural labourers, 246 in house hold industries, 11,406 other workers, 2,035 marginal workers, 54 marginal cultivators, 127 marginal agricultural labourers, 173 marginal workers in household industries and 1,681 other marginal workers. Sivaganga town had a growth of 25% during the decades of 1991 and 2001. The population density of the town has nearly doubled in the decades of 1981, 1991 and 2001. Spread over area of , the density increased from 3500 person per km in 1981 and to 4800 person per km in 1991. The development was largely concentrated along the whole town area.