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  1. Ada County is located in the southwestern part of Idaho, United States. As of the 2020 census, the county had a population of 494,967, which by 2022 was estimated to have risen to 518,907. Ada County is by far the state's most populous county; it is home to 26.8% of the state's population.

  2. The official Ada County, Idaho, website for local government offices and departments. Ada County is a great place to live and work!

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  4. Phone: (208) 287-6840 Fax: (208) 287-6849. County Seat: Boise. Ada County Website. Named for Ada Riggs, daughter of H.C. Riggs, one of the founders of Boise and a member of the Idaho Territorial Legislature who introduced legislation to move the capital from Lewiston to Boise.

  5. Ada County is the largest county by population in Idaho, home to approximately 25% of the state’s residents. Ada County is more than one thousand square miles of high desert beauty, peppered with foothills and a glistening river that winds through urban and rural landscapes.

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