Ada County was established on December 22, 1864, with its county seat at Boise. The county was named for Ada Riggs, the daughter of H. C. Riggs, one of the founders of Boise and a member of the Idaho Territorial Legislature. Boise became the capital of Idaho in 1865.
If you are an employee, a juror or member of the public, we ask that you please use the large paved parking lot on the East side of the courthouse. Additional employee parking is available in paved parking lots located on the West side of the building. All parking lots and structures on this site are owned and operated by Ada County.
Parking Fee: The public receives the first hour of parking at no charge and pays $1.00 for each hour (or portion of each hour) thereafter. Juror parking is paid by the court.