RANKING · 2020 CENSUS · 36 SHOWN OF 36

Largest by population, Oregon counties · 2020

The most populous us counties as of the 2023 estimates. This list covers the 36 counties in Oregon that qualify, ranked against each other statewide.

OregonAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPTOTAL POPULATIONVS 2000

01Multnomah County, OROR795,391815,428+23%

02Washington County, OROR611,708600,372+35%

03Clackamas County, OROR426,280421,401+25%

04Lane County, OROR381,584382,971+19%

05Marion County, OROR355,777345,920+21%

06Jackson County, OROR221,795223,259+23%

07Deschutes County, OROR213,072198,253+72%

08Linn County, OROR132,843128,610+25%

09Douglas County, OROR111,951111,201+11%

10Yamhill County, OROR110,024107,722+27%

11Benton County, OROR97,72895,184+22%

12Josephine County, OROR87,86788,090+16%

13Polk County, OROR90,03787,433+40%

14Umatilla County, OROR81,11980,075+14%

15Klamath County, OROR70,27469,413+9%

16Coos County, OROR63,99264,929+3%

17Columbia County, OROR54,09152,589+21%

18Lincoln County, OROR50,63650,395+13%

19Clatsop County, OROR40,92641,072+15%

20Malheur County, OROR32,26131,571−0%

21Tillamook County, OROR27,38427,390+13%

22Wasco County, OROR26,31026,670+12%

23Union County, OROR25,90026,196+7%

24Crook County, OROR27,56424,738+29%

25Jefferson County, OROR25,74024,502+29%

26Hood River County, OROR23,72023,977+17%

27Curry County, OROR22,62123,446+11%

28Baker County, OROR16,65816,668−0%

29Morrow County, OROR12,60212,186+11%

30Lake County, OROR8,1878,160+10%

31Harney County, OROR7,3807,495−1%

32Wallowa County, OROR7,5957,391+2%

33Grant County, OROR7,0757,233−9%

34Gilliam County, OROR1,9711,995+4%

35Sherman County, OROR2,0511,870−3%

36Wheeler County, OROR1,4721,451−6%

SHOWING 1–36 OF 36

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES