RANKING · 2020 CENSUS · 36 SHOWN OF 36

Most densely populated, Oregon counties · 2020

Oregon counties ranked by residents per square mile (2023). This list covers the 36 counties in Oregon that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Multnomah County, OROR795,3911,892+23%

02Washington County, OROR611,708829+35%

03Marion County, OROR355,777293+21%

04Clackamas County, OROR426,280225+25%

05Yamhill County, OROR110,024150+27%

06Benton County, OROR97,728141+22%

07Polk County, OROR90,037118+40%

08Lane County, OROR381,58484+19%

09Jackson County, OROR221,79580+23%

10Columbia County, OROR54,09180+21%

11Deschutes County, OROR213,07266+72%

12Linn County, OROR132,84356+25%

13Josephine County, OROR87,86754+16%

14Lincoln County, OROR50,63651+13%

15Clatsop County, OROR40,92650+15%

16Hood River County, OROR23,72046+17%

17Coos County, OROR63,99241+3%

18Umatilla County, OROR81,11925+14%

19Tillamook County, OROR27,38425+13%

20Douglas County, OROR111,95122+11%

21Curry County, OROR22,62114+11%

22Jefferson County, OROR25,74014+29%

23Union County, OROR25,90013+7%

24Klamath County, OROR70,27412+9%

25Wasco County, OROR26,31011+12%

26Crook County, OROR27,5648+29%

27Morrow County, OROR12,6026+11%

28Baker County, OROR16,6585−0%

29Malheur County, OROR32,2613−0%

30Wallowa County, OROR7,5952+2%

31Sherman County, OROR2,0512−3%

32Gilliam County, OROR1,9712+4%

33Grant County, OROR7,0752−9%

34Lake County, OROR8,1871+10%

35Wheeler County, OROR1,4721−6%

36Harney County, OROR7,3801−1%

SHOWING 1–36 OF 36

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