Columbia County, Oregon Cities (2024)

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

City
Rank
2024 Pop.
2020 Pop.
Change
Density (/mi²)
Area (mi²)
Type
St. Helens114,61113,9151.21%3,0124.9City
Scappoose28,3398,0190.97%2,4273.4City
Vernonia32,4402,3790.62%1,4851.6City
Columbia City41,9411,952-0.15%2,4730.8City
Rainier51,9321,9080.31%4734.1City
Clatskanie61,7631,7220.57%1,3561.3City
Warren71,5781,876-0.94%2506.3CDP
Deer Island8219105-2.67%4490.5CDP
Prescott980790%1,1590.1City

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Columbia County, Oregon?

St. Helens is the largest city in Columbia County.

What is the smallest city in Columbia County, Oregon?

Prescott is the smallest city in Columbia County.

How many cities are in Columbia County?

There are 9 cities in Columbia County, Oregon.

Frequently Asked Questions