Columbia County
Also known as Columbia County, Oregon, Columbia County, OR
county in Oregon, United States
Key facts
- Country
- United States
- State
- Oregon
- Founded
- January 16, 1854
- Named after
- Columbia River
- Seat
- St. Helens
- Largest city
- St. Helens
- Total
- 688 sq mi (1,780 km )
- Land
- 657 sq mi (1,700 km )
- Water
- 31 sq mi (80 km ) 4.5%
- Estimate 2025
- 54,091
- Density
- 75/sq mi (29/km )
- Time zone
- UTC−8 ( Pacific )
- Summer dst
- UTC−7 ( PDT )
~13 min read
Article
Columbia County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 52,589. The county seat is St. Helens.
History