Community Profile - Pinal County
Pinal County was formed from portions of Maricopa and Pima counties on Feb. 1, 1875, in response to the petition of residents of the upper Gila River Valley, as "Act #1" of the Eighth Territorial Legislature. Florence, established in 1866, was designated and has remained the county seat.
Arizona Department of Commerce. 2009b. Community Profile. Pinal County: Arizona. http://www.azcommerce.com/.... Accessed June 13, 2011.