Designed by prominent Arizona architect James M. Creighton in the Late Victorian Revival style of architecture, it is Pinal County's second courthouse.

The prosperity of the mine caused the establishment of the town of Pinal, located three miles southwest of present-day Superior.

Jere Fryer and Pauline Cushman, a Civil War Union spy, met and moved to Casa Grande.

In 1888 the “Duel at the Tunnel Saloon” took place in Florence between ex-sheriff Pete Gabriel and his ex-deputy Joe Phy.

The supervisors wanted to build a structure that represented their belief in future prosperity through mining and agriculture.

Built in American-Victorian architecture and totaling 15,000 square feet, the building housed the offices of the Supervisors, the Recorder, the Treasurer and the Assessor.

The bright and finished appearance demonstrated that Mr. Bernal was a conscientious workman, even on a county contract and understood his business.

By 1917, the first and only two-story additions were made to the northwest and southwest corners of the courthouse transforming the cruciform-shaped building to a “T” shape.

He took one look as the Gila River was filling the storage dam and said, “If that was my lake, I’d mow it.” In 1930 Eva Dugan received a sanity hearing in the courthouse after being convicted of murder.

In 1933 Winnie Ruth Judd received a sanity hearing in the courthouse after a double murder conviction.

In that same year, the Works Progress Administration, (WPA) labor helped with the first of the 3 single-story additions to the courthouse.

In 1952, the Pinal County Board of Supervisors voted to tear down the cupola, as its weight was causing the building to sag.

The second courthouse was still in use by county offices and in 1975 a third addition was constructed and spanned the entire length of the north side of the building.

By the late 1990s the Pinal County Board of Supervisors began researching the cost of restoring the courthouse.

In 2002, the first construction grant to repair the courthouse was secured from the State Park Heritage Fund.

In January 2003, the multi-phased rehabilitation project began, consisting of restoration of the clock tower, reinforcing the roof structure, reconstruction of the main entrance porch and restoration of some chimneys, roof dormers, exterior brick, and ornamental sheet metal items.

The five-story building, located on Jason Lopez Circle, cost $26 million and provided the county with 145,000 square feet of space.

On October 18, 2011, the Arizona Historical Advisory Commission (AHAC) sent a letter to Pinal County announcing that The “1891 Pinal County Courthouse Renovation” project was designated as an official Arizona Centennial Legacy Project.

On December 19 2012, a dedication and ribbon-cutting ceremony was held after a 12-month renovation project, including ridding the building of asbestos and aluminum wiring.

Interior windows at the top of the walls on the left and right side of the room still have the iron bars from the old jail, as a nod to history.

The second floor of the courthouse includes offices for the five supervisors and the County Manager, as well as the main room, which used to be the courtroom.

Instead, clock facings made of pressed metal were installed on each side of the tower, with the hands placed at 11:44.