According to the 2011 Census of India, the town of Mamit had a population of 9,836. The population has grown steadily over the last decade due to urbanization and its status as a district headquarters. The gender ratio in Mamit is highly equitable, reflecting broader trends in Mizo society which generally exhibit strong gender parity.
The town is predominantly inhabited by the Mizo people, who are largely Christian (predominantly Presbyterian and Baptist). Mizo is the lingua franca and the most widely spoken language at home and in local business, while English is used extensively in education and official government communications.
Mamit boasts a high literacy rate, consistent with the rest of Mizoram (which routinely ranks among the most literate states in India). The literacy rate for the town sits comfortably above 95%, with strong emphasis placed on education by both the community and local churches.