Tahtay Koraro (Tigrinya "Lower Koraro") is one of the woredas in the Tigray Region of Ethiopia. Part of the Semien Mi'irabawi Zone, Tahtay Koraro is bordered on the southwest by Asigede Tsimbela, on the north by La'ilay Adiyabo, and on the southeast by Medebay Zana. The town of Inda Selassie is surrounded by Tahtay Koraro.
Local landmarks in this woreda includes Mai Adrasha, an archeological site showing an uninterrupted chronological range from the Pre-Aksumite through the Late Aksumite periods (c. 800 BC - AD 700) - an indication of the site's importance both as a long-lived habitation in the area, and as the westernmost known example of this chronological range.
Based on the 2007 national census conducted by the Central Statistical Agency of Ethiopia (CSA), this woreda has a total population of 68,989, an increase of 83,492 over the 1994 census, of whom 34,477 are men and 34,512 women are urban inhabitants. With an area of 1,940.38 square kilometers, Tahtay Koraro has a population density of 35.55, which is less than the Zone average of 40.21. A total of 14,273 households were counted in this woreda, resulting in an average of 4.83 persons to a household, and 13,842 housing units. The majority of the inhabitants said they practiced Ethiopian Orthodox Christianity, with 97.72% reporting that as their religion, while 2.18% of the population were Muslim.
The 1994 national census reported a total population for this woreda of 83,492, of whom 40,933 were men and 42,559 were women; 25,991 or 31.13% of its population were urban dwellers. The largest ethnic group reported in Tahtay Koraro was the Tigrayan (98.98%), and Tigrinya was spoken as a first language by 98.97%. The majority of the inhabitants practiced Ethiopian Orthodox Christianity, with 92.27% reporting that as their religion, while 7.67% were Muslim. Concerning education, 20.8% of the population were considered literate, which is greater than the Zone average of 9.01%; 33.01% of the children aged 7-12 were in primary school, which is greater than the Zone average of 11.34%; 3.38% of the children aged 13-14 were in junior secondary school, which is also greater than the Zone average of 0.65%; and 4.11% of the children aged 15-18 were in senior secondary school, which is greater than the Zone average of 0.51%. Concerning sanitary conditions, about 80% of the urban houses and 35% of all houses had access to safe drinking water at the time of the census; about 32% of the urban and 12% of all houses had toilet facilities.