According to the 1998 census, the total population of FR Lakki was 6,987, including 3,450 males and 3,537 females. The male to female ratio is 98/100, which is less than the national ratio of 106/100. (Source: Bureau of Statistics- FATA cell, 2012-13).
F.R. Lakki Marwat is inhabited by Boba, Bobak and Wargara clans of the Bhittanis.