Pinal County is a county in the central part of the U.S. state of Arizona. As of the 2010 census, the population was 375,770, making it Arizona's third-most populous county. 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.
Pinal County is included in the Phoenix-Mesa-Scottsdale, AZ Metropolitan Statistical Area. Suburban growth southward from greater Phoenix has begun to spread into the northern parts of the county; similarly, growth northward from Tucson is spreading into the southern portions of the county. The Pinal County cities of Maricopa and Casa Grande, as well as many unincorporated areas, have shown accelerated growth patterns in recent years; such suburban development is likely to continue for the foreseeable future.
According to the U.S. Census Bureau, the county has a total area of 5,374 square miles (13,920 km²), of which 5,366 square miles (13,900 km²) is land and 8.6 square miles (22 km²) (0.2%) is water.
As of the 2010 United States Census, there were 375,770 people, 125,590 households, and 92,157 families residing in the county. The population density was 70.0 inhabitants per square mile (27.0/km²). There were 159,222 housing units at an average density of 29.7 per square mile (11.5/km²). The racial makeup of the county was 72.4% white, 5.6% American Indian, 4.6% black or African American, 1.7% Asian, 0.4% Pacific islander, 11.5% from other races, and 3.8% from two or more races. Those of Hispanic or Latino origin made up 28.5% of the population. In terms of ancestry, 16.9% were German, 10.6% were Irish, 9.5% were English, and 2.8% were American.
Of the 125,590 households, 37.0% had children under the age of 18 living with them, 55.8% were married couples living together, 11.7% had a female householder with no husband present, 26.6% were non-families, and 20.5% of all households were made up of individuals. The average household size was 2.78 and the average family size was 3.21. The median age was 35.3 years.
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