The 1994 national census reported a total population for this woreda of 92,137, of whom 45,599 were men and 46,538 women; 7,999 or 8.68% of its population were urban dwellers at the time. The two largest ethnic groups reported in Adda Berga were the Oromo (91.76%), and the Amhara (7.58%); all other ethnic groups made up 0.66% of the population. Oromo was spoken as a first language by 95.5%, while 4.16% spoke Amharic; the remaining 0.34% spoke all other primary languages reported. The majority of the inhabitants professed Ethiopian Orthodox Christianity, with 98.93% of the population reporting they practiced that belief.