Washington County
Also known as Washington County, Idaho, Washington County, ID
county in Idaho, United States
Key facts
- Country
- United States
- State
- Idaho
- Founded
- February 20, 1879
- Named after
- George Washington
- Seat
- Weiser
- Largest city
- Weiser
- Total
- 1,474 sq mi (3,820 km )
- Land
- 1,453 sq mi (3,760 km )
- Water
- 21 sq mi (54 km ) 1.4%
- Estimate 2025
- 11,583
- Density
- 7.23/sq mi (2.79/km )
- Time zone
- UTC−7 ( Mountain )
- Summer dst
- UTC−6 ( MDT )
Article
Washington County is a county in the U.S. state of Idaho. As of the 2020 census, the population was 10,500. The county seat and largest city is Weiser, with over half of the county's population. The county was established in 1879 when Idaho was a territory and named after U.S. President George Washington.
Geography