Jefferson County
Also known as Jefferson County, Oregon, Jefferson County, OR
county in Oregon, United States
Key facts
- Country
- United States
- State
- Oregon
- Founded
- December 12, 1914
- Named after
- Mount Jefferson
- Seat
- Madras
- Largest city
- Madras
- Total
- 1,791 sq mi (4,640 km )
- Land
- 1,781 sq mi (4,610 km )
- Water
- 10 sq mi (26 km ) 0.6%
- Estimate 2025
- 25,740
- Density
- 12/sq mi (4.6/km )
- Time zone
- UTC−8 ( Pacific )
- Summer dst
- UTC−7 ( PDT )
Article
Jefferson County is one of the 36 counties in the U.S. state of Oregon. At the 2020 census, the population was 24,502. The county seat is Madras. The county is named after Mount Jefferson, the second tallest mountain in Oregon.
History