The 1994 national census reported a total population for this woreda of 97,586, of whom 47,820 were men and 49,766 women; 9,997 or 10.24% of its population were urban dwellers at the time. The two largest ethnic groups reported in Mennana Harena Buluk were the Oromo (93%), and the Amhara (5.49%); all other ethnic groups made up 1.51% of the population. Oromiffa was spoken as a first language by 91.88%, and 7.49% spoke Amharic; the remaining 0.63% spoke all other primary languages reported. The majority of the inhabitants were Muslim, with 79.97% of the population having reported they practiced that belief, while 19.26% of the population said they professed Ethiopian Orthodox Christianity.