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Ada County is located in the southwestern part of Idaho, United States. As of the 2021 United States census estimate, the county had a population of 511,931, [1] 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, [2] which is also the state capital. [3]

Ada County Offices. 200 W. Front Street Boise, Idaho 83702. Phone: (208) 287-6840 Fax: (208) 287-6849. County Seat: Boise. Ada County Website

Contact the Clerk’s Office. Phone: 208 287-6879. Mail: 200 W Front St, Boise, ID 83702. Office: 200 W Front St, Boise, ID 83702. Email: adacountyclerk@adacounty.id.gov. Courts. 208-287-6900.

Ada County, Property Search, Property Assessments, Online Maps, Property Tax Exemptions, Assessment Data, Addressing, Motor Vehicle Registration

Welcome to the Ada County Treasurer’s Office! Our mission is to serve the citizens of Ada County and perform all duties impartially and efficiently. The Treasurer is responsible for the safekeeping and investment of public funds.

Development Services staff helps guide growth on behalf of Ada County residents and leaders through every development (and building) activity. Our Vision Balancing growth for a sustainable future while maintaining the trust of those we serve.

Non Emergency Dispatch 208-377-6790. Report Child Abuse 208-334-KIDS. Court Assistance 208-287-6963. Code Enforcement 208-577-3726. Illegal Dumping Complaints. Landfill.

The Ada County Sheriff’s Office is the largest local law enforcement agency in Idaho, with over 800 employees. That includes over 325 commissioned deputies and over 400 professional staffers. The Ada County Sheriff’s Office is committed to giving every citizen the best possible service.