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 the context of Tiro Afeta's demographics, the Oromo formed the largest group with 93.71%, followed by the Yem with 5.27%; the remaining population was comprised of smaller ethnic groups that collectively made up 1.02%.