[3] According to the 2011 census Kolasib district has a population of 83,955, roughly equal to the nation of Andorra.

The district has a population density of 61 inhabitants per square kilometre (160/sq mi).

Its population growth rate over the decade 2001-2011 was 27.28%.

Kolasib has a sex ratio of 956 females for every 1000 males, and a literacy rate of 93.50%.

[7] Languages spoken in Kolasib district (2011)[8] According to the 2011 census, 75.93% of the population spoke Mizo, 7.56% Hmar, 5.30% Bengali, 4.63% Tripuri, 1.90% Nepali and 1.33% Hindi as their first language.