maricopa county arizona population
Population of Maricopa County. Last official estimated population of Maricopa County was 3,823,609 (year 2014)[1]. This was 1.199% of total US population and 56% of total Arizona state population. Area of Maricopa County is 9,224.4 miÂ² (=23891.1 kmÂ²), in this year population density was 414.51 p/miÂ². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Maricopa County population in 2017 would be 3,828,485 .