According to the 1998 census, the total population of FR Bannu was 19,593 with 10,380 males and 9,213 females. The male to female ratio is 113/100, which is way above the national ratio of 106/100. As per the 1998 census, population density in the FR Bannu is 26 persons per kilometers with annual growth of about 2.5%. In 2013 according to the estimates compiled by the Bureau of Statistics, its population reached 26,000 persons. There are no urban centers in the region and according to the 1998 census; there were 160 villages at the time of the census. (Source: Bureau of Statistics, FATA Cell, 2008 – 2009).

The two main tribes of FR Bannu are Ahmadzai and Utmanzai.