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Ada County is located in the southwestern part of Idaho, United States. As of the 2020 census , the county had a population of 494,967, [1] which by 2022 was estimated to have risen to 518,907. [2] Ada County is by far the state's most populous county; it is home to 26.8% of the state's population.
Find information about Ada County government offices, departments, services, events and news. Learn about the county budget, assessment notices, adoption day, drug court and more.
Ada County Website. 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 the largest county by population in Idaho, home to approximately 25% of the state’s residents. 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.
In 2022, Ada County, ID had a population of 497k people with a median age of 38.1 and a median household income of $83,881. Between 2021 and 2022 the population of Ada County, ID grew from 485,246 to 497,494, a 2.52% increase and its median household income grew from $75,115 to $83,881, a 11.7% increase.
Ada County, Idaho has 1,052.0 square miles of land area and is the 31st largest county in Idaho by total area. Topics in the Ada County, Idaho data profile include: Populations and People; Income and Poverty; Education; Employment; Housing; Health; Business and Economy; Families and Living Arrangements; Race and Ethnicity
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Ada County, Idaho has 1,052.0 square miles of land area and is the 31st largest county in Idaho by total area.
