In this research paper we will examine the trend of population growth in North Bihar Plain, as against state of Bihar, and will also project growth of population in future up to 2051.This will also try to find out the reasons behind the phenomenal growth of population in the study area. North Bihar is a plain region which has been formed due to deposition of sediments brought down by different rivers originating from Himalayan region and peninsular India, and because of this it is very fertile land, prone to flood, almost every year, which causes huge loss of human lives, property, agriculture and other infrastructure. Agriculture is the main economic activity of the study area, especially of the food crops, in which paddy is the main crop. After Utter Pradesh and Maharashtra, Bihar is the third most populous state in the country, accounting for a total population of 104099452 with a density of 1106 persons per square kilometer. Growth of population is associated with a variety of demographic, socio-cultural factors, and, therefore, it reflects the prevailing dynamism of demographic characters in the study area. The density of population of North Bihar is not only greater than the density of Bihar, but it is much higher than the density of national average, which is going to be the greatest problem in near future.

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