Population density is largely influenced by the climatic and ecological factors. Areas with good climatic condition and fertile soils will generally have dense populations.
The average population density of the County is 150 persons per Km2.
Based on the 2009 Census, Maara constituency is the most densely populated with 230 persons per sq. km while Tharaka constituency is the least densely populated with 83 persons per sq. km.
As per the 2018 projections, Maara constituency remains to be the most densely populated. The population distribution can also be shown by indicating the composition of the different sexes in the three constituencies.
Population composition according to the different sexes helps to determine the sex ratio.