Ada County Updates Animal Control Ordinance. Following several months of public comment including in-person testimony, emails, and phone calls, Ada County Commissioners have approved an update to the Ada County Animal Control Ordinance. This ordinance applies to those living in Unincorporated Ada County.
Established: December 22, 1864. Size: 1,055 square miles. History: 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. Boise became the capital of Idaho in 1865.
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,  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 Clerk. If you have ever voted, filed paperwork for a court case, picked up a marriage license or applied for a permit in Ada County, we have helped you. We do our best each and every day to make sure your experiences working with our office go as smoothly and efficiently as possible. We’ve worked to make this website easy to use.
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. Ada County includes Idaho’s capital city Boise and it is home to five other distinct municipalities: Star, Eagle, Meridian, Garden City, and Kuna.
Welcome to the Ada County Assessor’s Office. Our office strives to ensure timely and relevant information is available to site users and constituents. We are continually monitoring and updating site content to fit the needs of the public to provide an informative and transparent user-experience. If you have suggestions or are unable to find information on a specific topic please visit our Contact us page to send us your suggestion or request, or if you have a general question please use ...
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. The Treasurer serves as ex officio tax collector, responsible for the collection of property taxes levied by the taxing districts, including cities and schools.
Our department is comprised of four divisions: Building, Planning, Engineering/Surveying, and Permitting. Our building division reviews plans and inspects buildings to ensure Ada County residents are safe in any building they walk into. Our planning division processes land use applications in unincorporated Ada County and works with the Ada County Historic Preservation Council to encourage the preservation of historically and culturally significant sites and structures throughout Ada County.
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. Our main goal is to ensure Ada County is a safe place to live, work, and play.
Read local news stories about Boise, Meridian, Eagle, Garden City, Kuna, Star, western Ada County and surrounding areas. Enjoy today's coverage on crime, weather, sports, community events and more.