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Since the partition of India in 1947, the majority of the Bengali Muslims have lived in Bangladesh. Islam is the second and the fastest growing religion in West Bengal. However, the Indian state of West Bengal also has over 24.6 million Bengali Muslims, who form 27% of the state's population. Another estimate shows that Muslims make up almost 30% of West Bengal population. In West Bengal capital Kolkata Muslim's Population is 926,414 making up 20.6% of the city population as of 2011 census. Bengali Muslims are minority in all districts of Bengal except Uttar Dinajpur, Maldah and Murshidabad. It is also said that this rise is due to proximity to Muslim-dominated districts of neighboring state of Bihar and illegal migration from Bangladesh cause demography change in the state.