Columbia County, Oregon

Columbia County: County in Oregon, United States


Columbia County is a county located in the U.S. state of Oregon. As of the 2010 census, the population was 49,351 and a population density of 28 people per km². After 10 years in 2020 county had an estimated population of 52,876 inhabitants. Its county seat is St. Helens. The county was created 169 years ago in 1853.

Quick Facts about Columbia County

Population : 52,876 (2020)
Country : United States of America
State : Oregon (United States)
Different from : Columbia County, Columbia County, Columbia County, Columbia County, Columbia County, Columbia County, Columbia County
Area : 1783 km2
Water as percent of area : 4.5%
Land as percent of area : 95.5%
Named for : Columbia River
Capital : St. Helens
Establishment : January 01, 1854
Time Zone : America/Los_Angeles
Local time : 20:58:19 (5th June 2023)
Density : 30 Pop. per km² as of 2020
Population growth : 6.67% (2010-2020)
Columbia County locator map
Location of Columbia County on Oregon map.
ColumbiaCountyORCourthouse image
ColumbiaCountyORCourthouse image


Columbia County is located at 45°56'38"N 123°5'17"W (45.9437700, -123.0880500). It has 7 neighbors: Clatsop County, Multnomah County, Tillamook County, Washington County, Clark County, Cowlitz County and Wahkiakum County.

Columbia County map

The largest city of Columbia County is Saint Helens with a population of 14,071. Other cities include, Scappoose population 7,618, Vernonia population 2,295, Columbia City population 2,022 and Rainier population 2,021. See all Columbia County cities & populated places.

Columbia County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Columbia County.

City Name Population Title
Saint Helens 14,071 City in Oregon, USA
Scappoose 7,618 City in Oregon, USA
Vernonia 2,295 City in Oregon, USA
Columbia City 2,022 City in Oregon, USA
Rainier 2,021 City in Oregon, USA
Clatskanie 1,832 City in Oregon, USA
Prescott 63 City in Oregon, USA

Columbia County has 7 neighbours.

  • St. Helens


The population of Columbia County increased by 6.67% in 10 years.

Year Population % Change Method
2010 49,351 - census
2011 49,406 0.11% estimation process
2012 49,214 -0.39% estimation process
2013 49,259 0.09% estimation process
2014 49,494 0.47% estimation process
2015 49,646 0.31% estimation process
2016 50,905 2.47% estimation process
2017 51,724 1.58% estimation process
2018 52,245 1% estimation process
2019 52,354 0.21% estimation process
2020 52,876 0.99% estimation process

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People born in Columbia County (1)

American actor Robert Cornthwaite was born in Columbia County

Other places with the same name (8)

Oregon Other Counties (more counties)

County Name Population Title
Multnomah County 815,637 County in Oregon, United States
Portland 656,751 City in Oregon, USA
Washington County 603,514 County in Oregon, United States
Clackamas County 421,596 County in Oregon, United States
Lane County 382,986 County in Oregon, United States
Marion County 349,204 County in Oregon, United States
Jackson County 221,844 County in Oregon, United States
Deschutes County 201,769 County in Oregon, United States
Salem 175,891 City and capital of Oregon, USA
Eugene 173,236 City in Lane County, Oregon, United States
Linn County 131,054 County in Oregon, United States
Terrebonne 117,664 Census-designated place in Deschutes County, Oregon
Douglas County 111,364 County in Oregon, United States
Hillsboro 110,985 City in Oregon, USA
Gresham 110,031 City in Oregon, USA
Yamhill County 107,664 County in Oregon, United States