Barmanthi 12 is a village in Diphu tehsil in district of Karbi Anglong, Assam, India. As per the data provided by Census of India in 2011, total population of Barmanthi 12 was 1,023 which includes 533 males and 490 females. Barmanthi 12 covers 29 ha area. Pincode of Barmanthi 12 is 782480.