Arizona has 15 counties all serves as a local government unit within the state. Each county vary in size, population with Maricopa County having the highest population.
The counties in Arizona were established as early as 1864 following the organization of the territory with each having a county seat.
List of Arizona counties in alphabetical order
1. Apache County
2. Cochise County
3. Coconino County
4. Gila County
5. Graham County
6. Greenlee County
7. La Paz County
8. Maricopa County
9. Mohave County
10. Navajo County
11. Pima County
12. Pinal County
13. Santa Cruz County
14. Yavapai County
15. Yuma County
Scannable list of Arizona counties
Apache County
Cochise County
Coconino County
Gila County
Graham County
Greenlee County
La Paz County
Maricopa County
Mohave County
Navajo County
Pima County
Pinal County
Santa Cruz County
Yavapai County
Yuma County
List of Arizona counties by size from largest to smallest
Coconino County (18,661 square miles)
Mohave County (13,470 square miles)
Apache County (11,218 square miles)
Navajo County (9,959 square miles)
Maricopa County (9,224 square miles)
Pima County (9,189 square miles)
Yavapai County (8,123 square miles)
Cochise County (6,210 square miles)
Yuma County (5,514 square miles)
Pinal County (5,367 square miles)
Gila County (4,758 square miles)
Graham County (4,622 square miles)
La Paz County (4,497 square miles)
Greenlee County (1,843 square miles) Santa Cruz County (1,236 square miles) (smallest).
Interesting facts about the Arizona Counties
Apache County
Apache County was established in 1879 and was named after the Apache people.
Cochise County
Cochise County was created in 1881 and was named after the leader of the Apache leader Cochise.
Coconino County
Coconino County was formed in 1891. It is the largest county in Arizona and has a fascinating featuring especially the Grand Canyon.
Gila County
Gila County was established in 1881. It's name originated from the Gila River.
Graham County
Graham County was created in 1881. It is known for its mining history and the presence of Mount Graham.
Greenlee County
Greenlee County formed in 1909. It's name was coined from the pioneer, Mason Greenlee.
La Paz County
The next county on the list is the La Paz County which is the newest county in Arizona. It was created in 1983.
Maricopa County
Maricopa County was established in 1871 and is the most populous county in Arizona state. It is also the count of Phoenix.
Mohave County
Mohave County is one of the original counties from 1864.
Navajo County
Navajo County was created in 1895 and named after the Navajo Nation.
Pima County
Pima County is one of the original counties from 1864.
Pinal County
Pinal County was established in 1875. The name was coined from the Pinal Peak.
Santa Cruz County
Santa Cruz County was formed in 1899. It's name was coined from the Santa Cruz River.
Yavapai County
Yavapai County is one of the original counties from 1864.
Yuma County
Yuma County is also one of the original counties from 1864.