Ada County, Idaho

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Ada County
James A. McClure Federal Building and U.S. Courthouse in Boise, Idaho.
James A. McClure Federal Building and U.S. Courthouse in Boise, Idaho.
Map of Idaho highlighting Ada County
Location within the U.S. state of Idaho
Map of the United States highlighting Idaho
Idaho's location within the U.S.
Coordinates: 43°27′N 116°14′W / 43.45°N 116.24°W / 43.45; -116.24
Country United States
State Idaho
FoundedDecember 22, 1864
Named forAda Riggs
SeatBoise
Largest cityBoise
Area
 • Total1,060 sq mi (2,700 km2)
 • Land1,053 sq mi (2,730 km2)
 • Water7.9 sq mi (20 km2)  0.7%
Population
 (2020)
 • Total494,967
 • Density470/sq mi (180/km2)
Time zoneUTC−7 (Mountain)
 • Summer (DST)UTC−6 (MDT)
Congressional districts1st, 2nd
Websitewww.adaweb.net
County Code: 1A

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]

Communities[change | change source]

Cities[change | change source]

Census-designated places[change | change source]

References[change | change source]

  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.