The two largest ethnic groups reported in Tiro Afeta were the Oromo (93.71%), and the Yem (5.27%); all other ethnic groups made up 1.02% of the population.
In Tiro Afeta, the Oromo made up the majority with 93.71%, followed by the Yem with 5.27%; the remaining population consisted of smaller ethnic groups accounting for 1.02%.