)The four largest ethnic groups reported in Mieso were the Oromo (88.09%), the Somali (5.77%), the Amhara (3.46%), and the Argobba (0.66%); all other ethnic groups made up 2.02% of the population.Oromiffa was spoken as a first language by 88.37%, 5.61% spoke Amharic, and 5.29% spoke Somali; the remaining 0.73% spoke all other primary languages reported.