Arizona Population By County in 2021 (ACS-5Yrs)

Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Arizona was 7.08M. Among all Arizona counties, Maricopa was the most populated county (4.37M), followed by Pima (1.03M), and then Pinal (420.63K).

On the other hand, the least populated counties were: Greenlee (9.54K), La Paz (16.85K), and Graham (38.15K).

The chart and table below shows the population of each county and the percentage of Arizona population in each county.

You can see similar information for other states and by state for the United States.