The dominance of illegal Bangladeshi infiltrators in the Seemanchal region in Bihar has compelled the local Hindus to migrate to other areas. In districts that are collectively called Seemanchal, major demographic change has been taking place as Bangladeshis and Rohingyas are settling there in large numbers. Consequently, the Hindus have been reduced to a minority in the region.
Notably, the Seemanchal region of Bihar includes the districts of Kishanganj, Araria, Katihar, and Purnia bordering Bangladesh and Nepal. The population of Hindus in this area has dropped considerably. In Kishanganj, Hindus have become a minority. As per the official data of the 2011 census, the Muslim population makes up to 67.98 percent while the Hindu population is 31.43 percent.