What are the largest counties in Oregon?

Multnomah County is the largest county in Oregon, with 795,391 residents in 2025 (Census PEP). Washington County (611,708) and Clackamas County (426,280) come next.

Data as of 2025 · updated November 5, 2026

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All 36 ranked Oregon counties

Oregon counties ranked by population
Rank	County	Residents 2025	Change 2020–25
1	Multnomah County	795,391	−2.6%
2	Washington County	611,708	+1.8%
3	Clackamas County	426,280	+0.9%
4	Lane County	381,584	−0.7%
5	Marion County	355,777	+2.7%
6	Jackson County	221,795	−0.9%
7	Deschutes County	213,072	+6.8%
8	Linn County	132,843	+3.0%
9	Douglas County	111,951	+0.6%
10	Yamhill County	110,024	+2.2%
11	Benton County	97,728	+4.4%
12	Polk County	90,037	+2.3%
13	Josephine County	87,867	−0.4%
14	Umatilla County	81,119	+1.5%
15	Klamath County	70,274	+0.9%
16	Coos County	63,992	−1.5%
17	Columbia County	54,091	+2.6%
18	Lincoln County	50,636	+0.3%
19	Clatsop County	40,926	−0.6%
20	Malheur County	32,261	+1.9%
21	Crook County	27,564	+10.6%
22	Tillamook County	27,384	−0.3%
23	Wasco County	26,310	−1.1%
24	Union County	25,900	−1.0%
25	Jefferson County	25,740	+4.7%
26	Hood River County	23,720	−0.7%
27	Curry County	22,621	−3.8%
28	Baker County	16,658	−0.4%
29	Morrow County	12,602	+3.1%
30	Lake County	8,187	+0.2%
31	Wallowa County	7,595	+2.6%
32	Harney County	7,380	−1.7%
33	Grant County	7,075	−2.3%
34	Sherman County	2,051	+9.1%
35	Gilliam County	1,971	−2.1%
36	Wheeler County	1,472	+0.8%

How this is ranked

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built.

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Questions

What is the largest county in Oregon?

Multnomah County is the largest county in Oregon, with 795,391 residents in 2025 (Census PEP). Washington County (611,708) and Clackamas County (426,280) come next.

How is this ranking calculated?

More rankings for Oregon

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