 India census, Siaha had a population of 19,731. Males constitute 52% of the population and females 48%. Siaha has an average literacy rate of 79%, higher than the national average of 59.5%: male literacy is 80%, and female literacy is 77%. In Siaha, 16% of the population is under 6 years of age. Siaha is the fastest growing town in Mizoram, 2008 statistical handbook of Mizoram reveals that the town has a population of 29,275 in 2008 against 19,731 in 2001.

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