 With an estimated area of 2,166.41 square kilometers, Adaba has an estimated population density of 63.8 people per square kilometer, which is greater than the Zone average of 27.The 1994 national census reported a total population for this woreda of 97,586, of whom 47,820 were men and 49,766 women; 9,997 or 10.24% of its population were urban dwellers at the time.The two largest ethnic groups reported in Adaba were the Oromo (93%), and the Amhara (5.49%); all other ethnic groups made up 1.51% of the population.