St. Helens
- County:
- Columbia County
- County Seat:
- Yes
- Area (mi²):
- 4.882
- State:
- Oregon
St. Helens is a city located in Columbia County, Oregon. St. Helens has a 2026 population of 14,460. It is also the county seat of Columbia County. St. Helens is currently growing at a rate of 0.12% annually and its population has increased by 3.99% since the most recent census, which recorded a population of 13,905 in 2020.