Bihar is a state in the eastern region of India. It is the third-largest state by population and the twelfth-largest by area. As per provisional reports of Census India, the population of Bihar in 2011 is 104,099,452 (10.41 Crore), and according to Bihar Caste Census 2023, its population in 2023 is 130,725,310 (13.07 Crore or 130 million)
Source: Bihar Census Survey 2023
also read about Bihar Population By Caste and Religion