Data / Rankings / Population density / Counties in Oregon

Counties in Oregon by population density

Multnomah County had the highest population density of 36 counties in 2021, at 721.2 inhabitants per km². Harney County had the lowest, at 0.3 inhabitants per km². The median was 9.7 inhabitants per km² and the figure for Oregon was 17.1 inhabitants per km². Source: the U.S. Census Bureau.

Highest721.2Multnomah County
Lowest0.3Harney County
Median9.736 counties
Oregon17.1History

All counties, 2021

CSVChart (SVG)

Multnomah CountyMultnomah County: 721.2 inhabitants per km²721.2Washington CountyWashington County: 321.1 inhabitants per km²321.1Marion CountyMarion County: 113.7 inhabitants per km²113.7Clackamas CountyClackamas County: 87.5 inhabitants per km²87.5Yamhill CountyYamhill County: 58.3 inhabitants per km²58.3Benton CountyBenton County: 53.2 inhabitants per km²53.2Polk CountyPolk County: 46.6 inhabitants per km²46.6Lane CountyLane County: 32.7 inhabitants per km²32.7Columbia CountyColumbia County: 31.2 inhabitants per km²31.2Jackson CountyJackson County: 31.2 inhabitants per km²31.2Deschutes CountyDeschutes County: 26.3 inhabitants per km²26.3Linn CountyLinn County: 21.9 inhabitants per km²21.9Josephine CountyJosephine County: 20.9 inhabitants per km²20.9Lincoln CountyLincoln County: 20.1 inhabitants per km²20.1Clatsop CountyClatsop County: 19.5 inhabitants per km²19.5Hood River CountyHood River County: 17.8 inhabitants per km²17.8Coos CountyCoos County: 15.8 inhabitants per km²15.8Tillamook CountyTillamook County: 9.7 inhabitants per km²9.7Umatilla CountyUmatilla County: 9.6 inhabitants per km²9.6Douglas CountyDouglas County: 8.6 inhabitants per km²8.6Curry CountyCurry County: 5.6 inhabitants per km²5.6Jefferson CountyJefferson County: 5.4 inhabitants per km²5.4Union CountyUnion County: 5 inhabitants per km²5Klamath CountyKlamath County: 4.6 inhabitants per km²4.6Wasco CountyWasco County: 4.3 inhabitants per km²4.3Crook CountyCrook County: 3.3 inhabitants per km²3.3Morrow CountyMorrow County: 2.4 inhabitants per km²2.4Baker 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

RankCounties2021
inhabitants per km²		Change on 2020
1Multnomah County721.2-1.4%
2Washington County321.1+0.2%
3Marion County113.7+0.5%
4Clackamas County87.5+0.3%
5Yamhill County58.3+0.3%
6Benton County53.2-0.6%
7Polk County46.6+1.7%
8Lane County32.7+0.5%
9Columbia County31.2+0.9%
10Jackson County31.2+0.4%
11Deschutes County26.3+2.9%
12Linn County21.9+0.9%
13Josephine County20.9+0.5%
14Lincoln County20.1+1%
15Clatsop County19.5+1.9%
16Hood River County17.8+0.6%
17Coos County15.8+0.3%
18Tillamook County9.7+1.3%
19Umatilla County9.6-0.2%
20Douglas County8.6+0.8%
21Curry County5.6+0.9%
22Jefferson County5.4+2.1%
23Union County5+0.4%
24Klamath County4.6+1.2%
25Wasco County4.3+0.3%
26Crook County3.3+3.3%
27Morrow County2.4+1.2%
28Baker County2.1+1%
29Malheur County1.2+0.1%
30Wallowa County0.9+2%
31Sherman County0.9+2%
32Gilliam County0.6-0.2%
33Grant County0.6+0.8%
34Lake County0.4+1.3%
35Wheeler County0.3-0.3%
36Harney County0.3+1.4%

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 721.2 inhabitants per km² in 2021, according to the U.S. Census Bureau.

Which county has the lowest population density?

Harney County, with 0.3 inhabitants per km² in 2021.

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