The 1994 national census reported a total population for this woreda of 179,979, of whom 88,674 were men and 91,305 women; 5,110 or 2.84% of its population were urban dwellers at the time. The five largest ethnic groups reported in Seraro were the Oromo (80.04%), the Alaba (4.05%), the Kambaata (3.01%), the Welayta (2.82%), and the Amhara (1.01%); all other ethnic groups made up 9.07% of the population. Oromiffa was spoken as a first language by 78.99%, 8.3% spoke Hadiya, 4.89% spoke Alaba, 2.74% spoke Kambaata, and 2.35% spoke Amharic; the remaining 2.73% spoke all other primary languages reported. The majority of the inhabitants were Moslem, with 90.93% of the population reporting they practiced that belief, while 4.51% of the population said they were Ethiopian Orthodox Christianity, and 2.89% were Protestant.