Namchi has about one lakh residents, with 59% of the population are Hindus, 21% Buddhist, and about 16% Christians. The natives of Namchi are mostly workers. In addition, there are cultivators, agricultural laborers, and household industries that people are engaged in. Most of the residents here speak the Nepali language. The other official languages include Bhutia, Limbu, Newari, Rai, Gurung, Lepcha, Sherpa, Sunwar, and Tamang.
The Namchi Mohatsav is a very popular event organized at Namchi Central Park every October. The festivities are loved by locals and also have tourists come in to be part of the carnival. Several activities are hosted here, like flower exhibitions featuring native floral species, local folk dances, food stalls, handicrafts, and handloom stalls from every part of Sikkim.
While Namchi has a decent number of restaurants serving all kinds of cuisines, it is best to enjoy the local delicacies here, including Chhurpi soup, Masauyra Curry, Kodo Ko Roti, and Gya Kho and Kinema Curry.