According to the US Census Bureau population estimates, there were 7,158,024 people living in Arizona in 2018. Maricopa was the most populated county with 4,402,403 residents, followed by Pima with 1,036,554 residents, and Pinal with 446,806 residents. Greenlee with a population of 9,448 was the least populated county in Arizona in 2018.

Use the map below to interactively explore the population of each county in Arizona in 2018. The data can also be explored further by sorting and filtering with the table below.