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Ada County, Idaho

US county information
NameAda County
Largest cityBoise
US Area
Total Area1060.33 sq mi (2746.3 km2)
Land Area1054.99 sq mi (2732.4 km2)
Water Area5.34 sq mi (13.8 km2)
Population392365 (2010)
Density110/km2 (285/sq mi)
Named forAda Riggs,
first pioneer child born in county
Time zoneMountain
Time zoneMountain: UTC-7/-6: -7/-6

     Home | County | Ada County Idaho

Ada County is a county in the southwestern part of the U.S. state of Idaho. As of the 2010 Census, the county had a population of 392,365. The county seat and largest city is Boise. Other cities in the county with over 10,000 residents include Meridian, Eagle, Kuna, and Garden City. Ada County is by far the state's largest in population, containing more than 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.

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