 With an estimated area of 1,588.13 square kilometers, Ambo has an estimated population density of 163.8 people per square kilometer, which is greater than the Zone average of 152.8.The 1994 national census reported a total population for this woreda of 177,465, of whom 87,325 were men and 90,140 women; 39,535 or 22.28% of its population were urban dwellers at the time.The two largest ethnic groups reported in Ambo were the Oromo (92.58%), and the Amhara (5.76%); all other ethnic groups made up 1.16% of the population.