RANKING · 1990 CENSUS · 36 SHOWN OF 36

Most densely populated, Oregon counties · 1990

Oregon counties ranked by residents per square mile (1990). This list covers the 36 counties in Oregon that qualify, ranked against each other statewide. The median across all 36 is 20.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most population lost Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Multnomah County, OROR795,3911,355–

02Washington County, OROR611,708430–

03Marion County, OROR355,777193–

04Clackamas County, OROR426,280149–

05Benton County, OROR97,728105–

06Yamhill County, OROR110,02492–

07Polk County, OROR90,03767–

08Lane County, OROR381,58462–

09Columbia County, OROR54,09157–

10Jackson County, OROR221,79553–

11Clatsop County, OROR40,92640–

12Linn County, OROR132,84340–

13Lincoln County, OROR50,63640–

14Josephine County, OROR87,86738–

15Coos County, OROR63,99238–

16Hood River County, OROR23,72032–

17Deschutes County, OROR213,07225–

18Tillamook County, OROR27,38420–

19Douglas County, OROR111,95119–

20Umatilla County, OROR81,11918–

21Curry County, OROR22,62112–

22Union County, OROR25,90012–

23Klamath County, OROR70,27410–

24Wasco County, OROR26,3109–

25Jefferson County, OROR25,7408–

26Baker County, OROR16,6585–

27Crook County, OROR27,5645–

28Morrow County, OROR12,6024–

29Malheur County, OROR32,2613–

30Sherman County, OROR2,0512–

31Wallowa County, OROR7,5952–

32Grant County, OROR7,0752–

33Gilliam County, OROR1,9711–

34Lake County, OROR8,1871–

35Wheeler County, OROR1,4721–

36Harney County, OROR7,3801–

SHOWING 1–36 OF 36

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS