4,334 or 5.39% of its population were urban dwellers at the time. The two largest ethnic groups reported in Seru were the Oromo (93.64%), and the Amhara (6.08%); all other ethnic groups made up 0.28% of the population. Oromiffa was spoken as a first language by 90.62%, and 5.86% spoke Amharic; the remaining 3.52% spoke all other primary languages reported. The majority of the inhabitants were Muslim, with 63% of the population having reported they practiced that belief, while 36.8% of the population said they professed Ethiopian Orthodox Christianity. Notes Districts of Oromia Region