Pinal County, Arizona
![](/Images/godic/202502/02/Pinal_county_courthouse0117.jpg")
![Map of Arizona highlighting Pinal County](/Images/godic/202502/02/Map_of_Arizona_highlighting_Pinal_County.svg0117.png")
![Map of the United States highlighting Arizona](/Images/godic/202502/02/Map_of_USA_AZ.svg0117.png")
![Picketpost Peak, a prominent landmark above Superior.](/Images/godic/202502/02/Pickepost_Peak,_AZ0117.jpg")
Pinal County is a county located in the central part of the U.S. state of Arizona. As of the 2010 census, the population was 375,770, making it the third-most populous county in Arizona. The county seat is Florence. The county was founded in 1875.
Pinal County contains parts of the Tohono O'odham Nation, the Gila River Indian Community and the San Carlos Apache Indian Reservation, as well as the entirety of the Ak-Chin Indian Community.