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Population of Counties in Arizona (2024)

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2024 Population
Growth Since 2020
Area (mi²)
Density (/mi²)
Maricopa County4,615,9093.84%3.6K502Maricopa County location
Pima County1,068,8482.26%3.5K116Pima County location
Pinal County503,44117.03%2.1K94Pinal County location
Yavapai County251,9326.2%3.1K31Yavapai County location
Mohave County226,4595.73%5.1K17Mohave County location
Yuma County217,5685.79%2.1K39Yuma County location
Coconino County144,721-0.32%7.2K8Coconino County location
Cochise County123,793-1.38%2.4K20Cochise County location
Navajo County109,5502.61%3.8K11Navajo County location
Apache County64,539-2.08%4.3K6Apache County location
Gila County54,0841.37%1.8K11Gila County location
Santa Cruz County49,6364.03%47740Santa Cruz County location
Graham County40,2284.09%1.8K9Graham County location
La Paz County16,8851.91%1.7K4La Paz County location
Greenlee County9,411-1.23%7115Greenlee County location

There are 15 counties in Arizona. Maricopa County, with its population of 4,410,824 as of 2019, is the most populous county located within the state of Arizona. Since the time of the last U.S. census in 2010, Maricopa County, home of Phoenix, has seen an increase in the total population of the county of 15.31%. Other major counties after Maricopa County are Pima County (1,039,073) with the city of Tuscon, Pinal County (447,138), Yavapai County (231,993), Yuma County (212,128), and Mohave County (209,550). All of these counties have experienced population growth since 2010 with the greatest growth in Pinal County at 17.81%.

Arizona Counties with the Fewest Residents

Greenlee County has the fewest residents in the state of Arizona with a population of 9,483. Since the 2010 United States census, Greenlee County’s population has experienced a growth rate of 13.81%. Behind Greenlee County, other counties under 50,000 residents in Arizona are La Paz County (21,098), Graham County (38,072), and Santa Cruz County (46,511). All of these counties except Santa Cruz County (-1.92%) have experienced growth, but none as high as Greenlee County.

Arizona Counties with Rapid Growth

Pinal County, with its growth rate of 17.81% since the 2010 U.S. census, is the fastest-growing county in Arizona. As of 2019, Pinal County has a population of 447,138, making it the 3rd most populous county in the state. Behind Pinal County is Maricopa County (15.31%), Greenlee County (13.81%), and Yavapai County (9.96%). The county with the lowest rate of growth, a decrease of 3.83%, is Cochise County.

Lists of Counties in all States