Idaho County
Also known as Idaho County, Idaho, Idaho County, ID
county in Idaho, United States
Key facts
- Country
- United States
- State
- Idaho
- Founded
- December 20, 1861
- Named after
- Idaho
- Seat
- Grangeville
- Largest city
- Grangeville
- Total
- 8,503 sq mi (22,020 km )
- Land
- 8,477 sq mi (21,960 km )
- Water
- 26 sq mi (67 km ) 0.3%
- Estimate 2025
- 17,874
- Density
- 1.951/sq mi (0.7534/km )
- North of salmon river
- UTC−8 ( Pacific )
- Summer dst
~13 min read
Article
Idaho County is a county in the U.S. state of Idaho, and the largest by area in the state. As of the 2020 census, the population was 16,541. The county seat is Grangeville. Previous county seats of the area were Florence (1864–68), Washington (1868–75), and Mount Idaho (1875–1902). Despite the name, Idaho City is in Boise County further south.
History