Pinal County, Arizona

Pinal County, Arizona
County
Second Pinal County Courthouse in Florence
Seal Logo
Location within the U.S. state of Arizona
Coordinates: 32°59′13″N 111°19′38″W
Country	United States
State	Arizona
Founded	February 1, 1875
Named for	Pinal Peak
Seat	Florence
Largest town	San Tan Valley
Area
• Total	5,374 sq mi (13,920 km2)
• Land	5,366 sq mi (13,900 km2)
• Water	8.6 sq mi (22 km2)  0.2%
Population  (2020)
• Total	425,264
• Estimate  (2025)	539,380
• Density	79.25/sq mi (30.60/km2)
Time zone	UTC−7 (Mountain)
Congressional districts	2nd, 5th, 6th, 7th
Website	www.pinal.gov

Pinal County (/pɪˈnæl/ pih-NAL) is a county in the central part of the U.S. state of Arizona. According to the 2020 census, the population of the county was 425,264, making it Arizona's third-most populous county. The county seat is Florence. The county was established in 1875.

Pinal County contains parts of the Tohono Oʼodham Nation, the Gila River Indian Community and the San Carlos Apache Indian Reservation, as well as all of the Ak-Chin Indian Community.

Pinal County is included in the Phoenix–Mesa–Chandler, Arizona Metropolitan Statistical Area. Suburban growth southward from greater Phoenix has begun to spread into the county's northern parts; similarly, growth northward from Tucson is spreading into the county's southern portions. Pinal County has five cities: Maricopa, Casa Grande, Apache Junction, Eloy, and Coolidge. There are also many unincorporated areas, which have shown accelerated growth patterns in recent years.