The U.S. government estimates the total population at 1.3 billion (midyear 2020 estimate). According to the 2011 national census, the most recent year for which disaggregated figures are available, Hindus constitute 79.8 percent of the population, Muslims 14.2 percent, Christians 2.3 percent, and Sikhs 1.7 percent. Groups that together constitute fewer than two percent of the population include Buddhists, Jains, Zoroastrians (Parsis), Jews, and Baha’is. The Ministry of Tribal Affairs officially recognizes more than 104 million members of Scheduled Tribes – indigenous groups historically outside the caste system who often practice indigenous religious beliefs – as Hindus in government statistics, although an estimated 10 million of those listed as Scheduled Tribe members are Christians, according to the 2011 census.

According to government estimates, there are large Muslim populations in the states of Uttar Pradesh, Bihar, Maharashtra, West Bengal, Telangana, Karnataka, and Kerala. Muslims constitute 68.3 percent of the population in the Union Territory of Jammu and Kashmir, the only state or territory in which Muslims are a majority. Slightly more than 85 percent of Muslims in the country are Sunni, with the remainder mostly Shia. Christian populations are distributed throughout the country but in greater concentrations in the northeast as well as in the states of Kerala, Tamil Nadu, and Goa. Three northeastern states have majority Christian populations: Nagaland (90 percent), Mizoram (87 percent), and Meghalaya (70 percent). Sikhs constitute 54 percent of the population of Punjab. The Dalai Lama’s office estimates that there are significant resettled Tibetan Buddhist communities in Himachal Pradesh, Karnataka, Uttarakhand, and Delhi. According to the Office of the United Nations High Commissioner for Refugees and media reports, there are approximately 100,000 Tibetan Buddhists in the country. According to media reports, approximately 40,000 Muslim Rohingya refugees from Burma live in the country.