Ada County, Idaho

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Ada County is a county in the southwestern part of the U.S. state of Idaho. As of the 2000 Census, the county had a population of 300,904 (2008 estimate: 380,920).[1] The county seat and largest city is Boise.[2] Other cities in the county with over 10,000 residents include Meridian, Eagle, Kuna, and Garden City.[3] Ada County is by far the state's largest in population, containing almost one quarter of the state's residents, and contains its only county highway district; the Ada County Highway District (ACHD) has jurisdiction over all the local county and city streets, except for private roads and state roads.

Ada County is part of the Boise City-Nampa, Idaho Metropolitan Statistical Area.

Contents

History

Ada County was created by the Idaho Territorial Legislature on December 22, 1864. It is named for Ada Riggs, the first pioneer child born in the area and the daughter of H.C. Riggs, a co-founder of Boise.[4] Canyon County was partitioned from western Ada County in the early 1890s. It is also the most incarcerated county in the nation.[5]

Geography

According to the United States Census Bureau, the county has a total area of 1,060 square miles (2,700 km2), of which 1,055 square miles (2,730 km2) is land and 5 square miles (13 km2) (.50%) is water. The Boise River flows through the northern portion of the county, and the northwest border is bounded by the foothills of the Boise Range mountains, the summits are in adjacent Boise County. The southwestern border of the county is bounded by the Snake River.

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