As per details from Census 2011, Bihar has population of 10.41 Crores, an increase from figure of 8.30 Crore in 2001 census. Total population of Bihar as per 2011 census is 104,099,452 of which male and female are 54,278,157 and 49,821,295 respectively. In 2001, total population was 82,998,509 in which males were 43,243,795 while females were 39,754,714.

The total population growth in this decade was 25.42 percent while in previous decade it was 28.43 percent. The population of Bihar forms 8.60 percent of India in 2011. In 2001, the figure was 8.07 percent.

Literacy rate in Bihar has seen upward trend and is 61.80 percent as per 2011 population census. Of that, male literacy stands at 71.20 percent while female literacy is at 46.40 percent. In 2001, literacy rate in Bihar stood at 47.00 percent of which male and female were 59.68 percent and 33.12 percent literate respectively.

In actual numbers, total literates in Bihar stands at 52,504,553 of which males were 31,608,023 and females were 20,896,530.

Total area of Bihar is 94,163 sq. km. Density of Bihar is 1,106 per sq km which is higher than national average 382 per sq km. In 2001, density of Bihar was 881 per sq km, while nation average in 2001 was 324 per sq km.

Sex Ratio in Bihar is 918 i.e. for each 1000 male, which is below national average of 940 as per census 2011. In 2001, the sex ratio of female was 921 per 1000 males in Bihar.