Arizona, a state located in the southwestern region of the United States, is divided into 15 counties. Each county has its unique characteristics, ranging from vast deserts to mountainous regions, and from urban centers to rural landscapes. The diverse geography and climate of Arizona's counties support a wide range of ecosystems, making the state a popular destination for outdoor enthusiasts and nature lovers.
The history of county formation in Arizona dates back to the late 19th century, with the first county, Yavapai County, being established in 1864. Over the years, the number of counties has increased, with the most recent addition being La Paz County, which was formed in 1983. Today, the 15 counties in Arizona are: Apache, Cochise, Coconino, Gila, Graham, Greenlee, La Paz, Maricopa, Mohave, Navajo, Pima, Pinal, Santa Cruz, Yavapai, and Yuma.
Key Points
- Arizona is divided into 15 counties, each with its unique geography and climate.
- The counties in Arizona support a wide range of ecosystems, including deserts, mountains, and urban centers.
- The history of county formation in Arizona dates back to the late 19th century, with the first county being established in 1864.
- The most recent county to be formed in Arizona was La Paz County, which was established in 1983.
- The 15 counties in Arizona are: Apache, Cochise, Coconino, Gila, Graham, Greenlee, La Paz, Maricopa, Mohave, Navajo, Pima, Pinal, Santa Cruz, Yavapai, and Yuma.
Geography and Climate of Arizona Counties

The geography and climate of Arizona’s counties vary greatly, ranging from the hot and dry deserts of Yuma and La Paz counties to the cool and mountainous regions of Coconino and Apache counties. The state’s diverse landscape is characterized by numerous mountain ranges, including the Rocky Mountains, the Sierra Ancha Mountains, and the Superstition Mountains. The Colorado River forms the western border of Arizona, while the New Mexico border lies to the east.
The climate in Arizona's counties is equally diverse, with temperatures ranging from below freezing in the winter months to over 100°F (38°C) in the summer. The state's desert regions, such as those found in Maricopa and Pinal counties, experience very hot summers and mild winters, while the mountainous regions, such as those found in Coconino and Yavapai counties, have cooler summers and colder winters.
Demographics of Arizona Counties
The demographics of Arizona’s counties vary greatly, with some counties having large urban populations and others being more rural. Maricopa County, which is home to the state capital Phoenix, is the most populous county in Arizona, with a population of over 4.5 million people. Pima County, which is home to the city of Tucson, is the second most populous county, with a population of over 1 million people.
In contrast, some of Arizona's counties are more rural, with smaller populations and more limited economic resources. La Paz County, for example, has a population of less than 21,000 people, while Greenlee County has a population of less than 10,000 people. Despite these challenges, many of Arizona's rural counties have rich cultural heritage and natural resources, making them attractive destinations for tourists and outdoor enthusiasts.
| County | Population (2020) | County Seat |
|---|---|---|
| Apache County | 66,580 | St. Johns |
| Cochise County | 125,448 | Bisbee |
| Coconino County | 145,101 | Flagstaff |
| Gila County | 53,597 | Globe |
| Graham County | 38,533 | Safford |
| Greenlee County | 9,563 | Clifton |
| La Paz County | 20,481 | Parker |
| Maricopa County | 4,420,568 | Phoenix |
| Mohave County | 207,413 | Kingman |
| Navajo County | 106,717 | Holbrook |
| Pima County | 1,043,465 | Tucson |
| Pinal County | 425,264 | Florence |
| Santa Cruz County | 47,420 | Nogales |
| Yavapai County | 228,430 | Prescott |
| Yuma County | 203,881 | Yuma |

Economy and Industry in Arizona Counties

The economy of Arizona’s counties is diverse, with major industries including tourism, agriculture, mining, and manufacturing. The state’s tourism industry is a significant contributor to the economy, with millions of visitors each year drawn to Arizona’s natural attractions, such as the Grand Canyon, Monument Valley, and the Superstition Mountains.
Agriculture is also an important industry in Arizona, with the state producing a wide range of crops, including cotton, hay, and lettuce. The mining industry is another significant contributor to the state's economy, with Arizona being a major producer of copper, gold, and silver. Manufacturing is also a growing industry in Arizona, with major companies such as Intel and Boeing having facilities in the state.
Challenges Facing Arizona Counties
Despite the many advantages of Arizona’s counties, there are also several challenges that they face. One of the major challenges is the issue of water scarcity, with many of the state’s counties experiencing droughts and water shortages. Another challenge is the issue of poverty, with some of the state’s counties having high levels of poverty and unemployment.
Education is also a challenge in some of Arizona's counties, with some areas having limited access to quality educational resources. Healthcare is another issue, with some counties having limited access to medical facilities and healthcare professionals. Despite these challenges, many of Arizona's counties are working to address these issues and improve the quality of life for their residents.
What are the 15 counties in Arizona?
+The 15 counties in Arizona are: Apache, Cochise, Coconino, Gila, Graham, Greenlee, La Paz, Maricopa, Mohave, Navajo, Pima, Pinal, Santa Cruz, Yavapai, and Yuma.
What is the most populous county in Arizona?
+Maricopa County is the most populous county in Arizona, with a population of over 4.5 million people.
What are the major industries in Arizona’s counties?
+The major industries in Arizona’s counties include tourism, agriculture, mining, and manufacturing.
What are some of the challenges facing Arizona’s counties?
+Some of the challenges facing Arizona’s counties include water scarcity, poverty, limited access to education and healthcare, and economic development.
How do Arizona’s counties contribute to the state’s economy?
+Arizona’s counties contribute to the state’s economy through a variety of industries, including tourism, agriculture, mining, and manufacturing. They also provide a range of services, including education, healthcare, and public safety.