The erstwhile Dinajpur District, at the time of the partition of India, was split up into West Dinajpur district and East Dinajpur. The East Dinajpur district, now called Dinajpur, became part of East Pakistan, now Bangladesh. The West Dinajpur district was enlarged in 1956, when States Reorganisation Act recommendations were implemented, with the addition of some areas of Bihar. The district was bifurcated into Uttar Dinajpur and Dakshin Dinajpur on April 1, 1992
