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List of Cities and Counties in Arizona
Discover Arizona’s population facts easily with our list of counties and cities. Find out how many people live in each area, from big cities to small towns, and see how Arizona’s population is spread out across the state.
Arizona Counties by Population
A county is an administrative subdivision of a US state or territory. As of 2022, Arizona is divided into 15 counties. Under the Arizona Constitution, counties are politically and legally creatures of the state, and do not have charters of their own.
Maricopa County is the most populous county in Arizona and the fourth-most populous in the United States. Greenlee County is the least populated and La Paz County is the least densely populated county in Arizona. Coconino County is the largest county by land area in Arizona and Santa Cruz County is the smallest by area.
read about the Population of Arizona
| # | County | Population 2021 | Area (sq. mi.) |
| 1 | Maricopa County | 4,496,588 | 9,224 |
| 2 | Pima County | 1,052,030 | 9,189 |
| 3 | Pinal County | 449,557 | 5,374 |
| 4 | Yavapai County | 242,253 | 8,128 |
| 5 | Mohave County | 217,692 | 13,470 |
| 6 | Yuma County | 206,990 | 5,519 |
| 7 | Coconino County | 145,052 | 18,661 |
| 8 | Cochise County | 126,050 | 6,219 |
| 9 | Navajo County | 108,147 | 9,959 |
| 10 | Apache County | 65,623 | 11,218 |
| 11 | Gila County | 53,589 | 4,796 |
| 12 | Santa Cruz County | 47,883 | 1,238 |
| 13 | Graham County | 39,050 | 4,641 |
| 14 | La Paz County | 16,408 | 4,513 |
| 15 | Greenlee County | 9,404 | 1,848 |
Source: US Census report 2021
read about the race and ethnicity in Arizona
Top cities in Arizona by population
Arizona is divided into 15 counties and contains 91 incorporated cities and towns. Phoenix is the capital and largest city by population in Arizona with 1,608,139 residents and is ranked as the fifth most populous city in the United States. Tucson is the second-largest city in the state followed by Mesa, both have populations of around half a million.
Let’s have a look at the top 20 cities in Arizona by population.
| # | Name | County | Population 2021 |
| 1 | Phoenix | Maricopa | 1,608,139 |
| 2 | Tucson | Pima | 542,629 |
| 3 | Mesa | Maricopa | 504,258 |
| 4 | Chandler | Maricopa | 275,987 |
| 5 | Gilbert | Maricopa | 267,918 |
| 6 | Glendale | Maricopa | 248,325 |
| 7 | Scottsdale | Maricopa | 241,361 |
| 8 | Peoria | Maricopa, Yavapai | 190,985 |
| 9 | Tempe | Maricopa | 180,587 |
| 10 | Surprise | Maricopa | 143,148 |
| 11 | Yuma | Yuma | 95,548 |
| 12 | Goodyear | Maricopa | 95,294 |
| 13 | Buckeye | Maricopa | 91,502 |
| 14 | Avondale | Maricopa | 89,334 |
| 15 | Flagstaff | Coconino | 76,831 |
| 16 | Queen Creek | Maricopa, Pinal | 59,519 |
| 17 | Maricopa | Pinal | 58,125 |
| 18 | Lake Havasu City | Mohave | 57,144 |
| 19 | Casa Grande | Pinal | 53,658 |
| 20 | Marana | Pima, Pinal | 51,908 |
Source: US Census 2020
Most Populous Counties in Arizona
The most populous county in Arizona is Maricopa County with 4.5 million residents. It’s the fourth most populous county in the United States. It is followed by Pima County (1 million) and Pinal County (0.4 million)
Let’s have a look at the most populous counties
| # | County | Population 2021 |
| 1 | Maricopa County | 4,496,588 |
| 2 | Pima County | 1,052,030 |
| 3 | Pinal County | 449,557 |
| 4 | Yavapai County | 242,253 |
| 5 | Mohave County | 217,692 |
Least Populated Arizona County
The least populous county is Greenlee County with 9,404 residents, it’s followed by La Paz and Graham County.
Let’s have look at 5 least populated counties in Arizona
| # | County | Population 2021 |
| 1 | Greenlee County | 9,404 |
| 2 | La Paz County | 16,408 |
| 3 | Graham County | 39,050 |
| 4 | Santa Cruz County | 47,883 |
| 5 | Gila County | 53,589 |
source: US Census 2021
read about religion in Arizona
Largest counties in Arizona by area
The Largest county by Land Area in California is San Bernardino County with an area of 20.062 sq. miles. Inyo with an area of 10,192 sq. mi. comes next followed by Kern county (8142 sq. mi.)
Let’s have a look at the Top 10 counties by Area
| # | County | Area (sq miles) |
| 1 | San Bernardino County | 20,062 |
| 2 | Inyo County | 10,192 |
| 3 | Kern County | 8,142 |
| 4 | Riverside County | 7,208 |
| 5 | Siskiyou County | 6,287 |
| 6 | Fresno County | 5,963 |
| 7 | Tulare County | 4,824 |
| 8 | Lassen County | 4,558 |
| 9 | San Diego County | 4,204 |
| 10 | Imperial County | 4,175 |
The smallest County in Arizona by the area
The smallest county by area in California is San Francisco with an area of 47 square miles.
| # | County | Area |
| 1 | San Francisco | 47 |
| 2 | Santa Cruz County | 446 |
| 3 | San Mateo County | 449 |
| 4 | Marin County | 520 |
| 5 | Sutter County | 603 |
source: US Census report 2021
Most densely populated Counties in Arizona
The most densely populated county in Arizona is Maricopa County, with 488 people per sq. mi. Next comes Pima County with 115 people per sq. mi followed by Pinal County (84/per sq.mi)
Let’s have a look at the Top 10 densely populated counties
| # | County | Density (people/sq. mi) |
| 1 | Maricopa County | 487.49 |
| 2 | Pima County | 114.49 |
| 3 | Pinal County | 83.65 |
| 4 | Santa Cruz County | 38.68 |
| 5 | Yuma County | 37.50 |
Least densely Populated County in Arizona
La Paz County with a population density of 3.64 people per sq. miles is the least densely populated county in Arizona
| # | County | Density (people/sq. mi) |
| 1 | La Paz County | 3.64 |
| 2 | Greenlee County | 5.09 |
| 3 | Apache County | 5.85 |
| 4 | Coconino County | 7.77 |
| 5 | Graham County | 8.41 |
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