Template:Wp-Ada County, Idaho

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Ada County is located in the southwestern part of the U.S. state of Idaho. As of the 2021 United States Census Estimate, the county had a population of 511,931, making it by far the state's most populous county; it is home to 26.8% of the state's population. The county seat and largest city is Boise, which is also the state capital. Ada County is included in the Boise metropolitan area. The Ada County Highway District (ACHD) has jurisdiction over all the local county and city streets, except for private roads and state roads. In the interior Northwest east of the Cascade Range, Ada County ranks second in population behind only Spokane County, Washington.