Columbia County, Oregon

Columbia County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF COLUMBIA GUS Population: 54,063 (2024) ID: 173611	County	Official County Government	Contact: LAND DEVELOPMENT SERVICES DIRECTOR 230 STRAND ST, SAINT HELENS OR 97051
CITY OF ST HELENS GUS Population: 14,460 (2024) ID: 173637	Municipal	Municipal Government Within County	Contact: CITY RECORDER PO BOX 278, SAINT HELENS OR 97051-0278
CITY OF SCAPPOOSE GUS Population: 8,282 (2024) ID: 205214	Municipal	Municipal Government Within County	Contact: CITY MANAGER 33568 E COLUMBIA AVE, SCAPPOOSE OR 97056-3423
CITY OF VERNONIA GUS Population: 2,428 (2024) ID: 187139	Municipal	Municipal Government Within County	Contact: MAYOR 1001 BRIDGE ST, VERNONIA OR 97064-1240
CITY OF COLUMBIA CITY GUS Population: 1,949 (2024) ID: 133207	Municipal	Municipal Government Within County	Contact: CITY ADMINISTRATOR/RECORDER PO BOX 189, COLUMBIA CITY OR 97018-0189
CITY OF RAINIER GUS Population: 1,932 (2024) ID: 173636	Municipal	Municipal Government Within County	Contact: CITY ADMINISTRATOR PO BOX 100, RAINIER OR 97048-0100
CITY OF CLATSKANIE GUS Population: 1,782 (2024) ID: 184241	Municipal	Municipal Government Within County	Contact: CITY RECORDER PO BOX 9, CLATSKANIE OR 97016-0009
CITY OF PRESCOTT GUS Population: 82 (2024) ID: 173635	Municipal	Municipal Government Within County	Contact: ADMINISTRATOR 72742 BLAKELY ST, RAINIER OR 97048-3801