The five largest ethnic groups reported in Bambasi were the  Amhara  (52%), the Berta (33.8%), the Oromo (12.4%), 12.3% Komo, the Tigray (4.7%), and the Mao (3.7%).
In the context of Bambasi, the largest ethnic groups were predominantly Amhara (52%), with notable numbers of Berta (33.8%), Oromo (12.4%), Komo (12.3%), Tigray (4.7%), and a relatively smaller proportion of Mao (3.7%).