Data / Rankings / Population density / Counties in Oregon

Counties in Oregon by population density

Multnomah County had the highest population density of 36 counties in 2020, at 731.2 inhabitants per km². Harney County had the lowest, at 0.3 inhabitants per km². The median was 9.6 inhabitants per km² and the figure for Oregon was 17.1 inhabitants per km². Source: the U.S. Census Bureau.

Highest731.2Multnomah County
Lowest0.3Harney County
Median9.636 counties
Oregon17.1History

All counties, 2020

CSVChart (SVG)

Multnomah CountyMultnomah County: 731.2 inhabitants per km²731.2Washington CountyWashington County: 320.4 inhabitants per km²320.4Marion CountyMarion County: 113.2 inhabitants per km²113.2Clackamas CountyClackamas County: 87.2 inhabitants per km²87.2Yamhill CountyYamhill County: 58.1 inhabitants per km²58.1Benton CountyBenton County: 53.5 inhabitants per km²53.5Polk CountyPolk County: 45.8 inhabitants per km²45.8Lane CountyLane County: 32.6 inhabitants per km²32.6Jackson CountyJackson County: 31 inhabitants per km²31Columbia CountyColumbia County: 30.9 inhabitants per km²30.9Deschutes CountyDeschutes County: 25.5 inhabitants per km²25.5Linn CountyLinn County: 21.7 inhabitants per km²21.7Josephine CountyJosephine County: 20.8 inhabitants per km²20.8Lincoln CountyLincoln County: 19.9 inhabitants per km²19.9Clatsop CountyClatsop County: 19.2 inhabitants per km²19.2Hood River CountyHood River County: 17.7 inhabitants per km²17.7Coos CountyCoos County: 15.7 inhabitants per km²15.7Tillamook CountyTillamook County: 9.6 inhabitants per km²9.6Umatilla CountyUmatilla County: 9.6 inhabitants per km²9.6Douglas CountyDouglas County: 8.5 inhabitants per km²8.5Curry CountyCurry County: 5.6 inhabitants per km²5.6Jefferson CountyJefferson County: 5.3 inhabitants per km²5.3Union CountyUnion County: 5 inhabitants per km²5Klamath CountyKlamath County: 4.5 inhabitants per km²4.5Wasco CountyWasco County: 4.3 inhabitants per km²4.3Crook CountyCrook County: 3.2 inhabitants per km²3.2Morrow CountyMorrow County: 2.3 inhabitants per km²2.3Baker CountyBaker County: 2.1 inhabitants per km²2.1Malheur CountyMalheur County: 1.2 inhabitants per km²1.2Wallowa CountyWallowa County: 0.9 inhabitants per km²0.9Sherman CountySherman County: 0.9 inhabitants per km²0.9Gilliam CountyGilliam County: 0.6 inhabitants per km²0.6Grant CountyGrant County: 0.6 inhabitants per km²0.6Lake CountyLake County: 0.4 inhabitants per km²0.4Wheeler CountyWheeler County: 0.3 inhabitants per km²0.3Harney CountyHarney County: 0.3 inhabitants per km²0.3
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2020
inhabitants per km²
1Multnomah County731.2
2Washington County320.4
3Marion County113.2
4Clackamas County87.2
5Yamhill County58.1
6Benton County53.5
7Polk County45.8
8Lane County32.6
9Jackson County31
10Columbia County30.9
11Deschutes County25.5
12Linn County21.7
13Josephine County20.8
14Lincoln County19.9
15Clatsop County19.2
16Hood River County17.7
17Coos County15.7
18Tillamook County9.6
19Umatilla County9.6
20Douglas County8.5
21Curry County5.6
22Jefferson County5.3
23Union County5
24Klamath County4.5
25Wasco County4.3
26Crook County3.2
27Morrow County2.3
28Baker County2.1
29Malheur County1.2
30Wallowa County0.9
31Sherman County0.9
32Gilliam County0.6
33Grant County0.6
34Lake County0.4
35Wheeler County0.3
36Harney County0.3

Other periods

About this ranking

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

Which county has the highest population density?

Multnomah County, with 731.2 inhabitants per km² in 2020, according to the U.S. Census Bureau.

Which county has the lowest population density?

Harney County, with 0.3 inhabitants per km² in 2020.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved 2026-10-09.

Population density: other rankings

Counties in Oregon: more rankings