There are 8 zip codes in Columbia County, Oregon. The most populated is 97051, located in Saint Helens. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
9705117,543Saint Helens
9705612,645Scappoose
970487,283Rainier
970166,551Clatskanie
970533,662Warren
970643,462Vernonia
970181,773Columbia City
970541,313Deer Island

Zip Codes in Columbia County, Oregon by Population (2024)