Unji Mustahakam is a village in Harraiya tehsil in district of Basti, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Unji Mustahakam was 3,954 which includes 2,062 males and 1,892 females. Unji Mustahakam covers 368.06 ha area. Pincode of Unji Mustahakam is 272131.