In 1991, the national population census estimated the population of the district at about 102,030. The 2002 national census estimated the district population at approximately 165,400. The annual population growth rate in the district is given as 4.5%. In 2012, the population of Kumi District was estimated at about 255,500. The table below illustrates how the district population has grown between 2002 until 2012. All numbers are estimates.