Ada County, Idaho

Ada County is a county in the U.S. state of Idaho. As of the 2020 Census, 494,967 people lived in the county.[1] That was more than any other county in Idaho. The county seat and largest city is Boise.[2] Boise is also the state capital.[3]

Ada County, Idaho
Map
Map of Idaho highlighting Ada County
Location in the state of Idaho
Map of the USA highlighting Idaho
Idaho's location in the U.S.
Statistics
Founded December 22, 1864
Seat Boise
Largest City Boise
Area
 - Total
 - Land
 - Water

1,060 sq mi (2,745 km²)
1,053 sq mi (2,727 km²)
7.9 sq mi (20 km²), 0.7
Population
 - (2020)
 - Density

494,967
Time zone Mountain: UTC-7/-6
Website: www.adaweb.net
Named for: Ada Riggs
County Code: 1A

Communities

Cities

Census-designated places

Ada County, Idaho Media

References

  1. "QuickFacts: Ada County, Idaho". United States Census Bureau. Retrieved September 25, 2023.
  2. "Find a County". National Association of Counties. Retrieved 2011-06-07.
  3. Idaho Department of Commerce (2011). "Facts About Idaho". Idaho Department of Commerce. Archived from the original on 2011-09-03. Retrieved 2011-11-10.