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Based on the 2007 national census conducted by the Central Statistical Agency of Ethiopia (CSA), this woreda has a total population of 109,244, an increase of -9.11% over the 1994 census, of whom 54,252 are men and 54,992 women; 11,434 or 10.47% are urban inhabitants.With an area of 740.96 square kilometers, Were Ilu has a population density of 147.44, which is roughly equal than the Zone average of 147.58 persons per square kilometer.A total of 25,212 households were counted in this woreda, resulting in an average of 4.33 persons to a household, and 24,216 housing units.