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Established December 22, 1864 with its county seat at Boise. Named for Ada Riggs, the first white child born in the area and 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.
County Seat: Boise
Land Area: 1,060 square miles.
County Clerk 200 West Front Street Boise, ID 83702 Phone: (208) 287-6840 Fax: (208) 287-6849
