 The three largest ethnic groups reported in Tahtay Adiyabo were the Tigrayan (71.36%), foreign residents from Eritrea (26.23%), and the Kunama (1.41%); all other ethnic groups made up 1% of the population.Tigrinya is spoken as a first language by 97.35%, and 1.39% speak Kunama; the remaining 1.26% spoke all other primary languages reported.96.33% of the population said they were Ethiopian Orthodox Christianity, and 3.49% were Muslim.