Which county in Oregon has the lowest flood risk?

Multnomah has the lowest flood risk in Oregon, at 36.2.

What is the flood risk in Multnomah?

Multnomah is ranked #1 in Oregon for flood risk, at 36.2.

What are the top counties in Oregon for flood risk?

Multnomah (36.2), then Washington (42.3), and Union (47.8). The full top 25 is in the table on this page.

How is this flood risk ranking calculated?

Counties in Oregon are ranked by flood risk (FEMA National Risk Index, FEMA NRI v1.20), lowest first. Values describe the county, not an individual property. Source vintage is shown on the page.

How does Oregon compare to the rest of the US for flood risk?

This list is Oregon only. See the national ranking of the lowest counties for flood risk at hearthmap.app/best/lowest-flood-risk.

Lowest Flood Risk Counties in Oregon (2026)

Lowest counties for flood risk in Oregon

Top 25 of 36 counties with data.

Ranked by flood risk (FEMA National Risk Index, FEMA NRI v1.20), lowest first.

Lowest counties for flood risk in Oregon

Rank	County	Value
01	Multnomah36.2 County page
02	Washington42.3 County page
03	Union47.8 County page
04	Marion47.8 County page
05	Jefferson53.5 County page
06	Crook55.8 County page
07	Clackamas58.3 County page
08	Benton58.8 County page
09	Deschutes59.0 County page
10	Hood River60.5 County page
11	Klamath61.8 County page
12	Yamhill63.1 County page
13	Polk63.3 County page
14	Sherman65.0 County page
15	Jackson66.2 County page
16	Linn69.6 County page
17	Baker70.5 County page
18	Harney72.2 County page
19	Umatilla73.6 County page
20	Lane73.7 County page
21	Gilliam76.5 County page
22	Wasco77.2 County page
23	Malheur78.3 County page
24	Columbia85.3 County page
25	Josephine88.1 County page

How this ranking works

This page ranks Oregon counties by flood risk, sorted so the lowest places appear first. Click any county to see its housing, schools, crime, and demographics in detail.

For flood risk, a lower value is generally more favorable, so the top of the list is the lowest. Want to weigh flood risk against schools, taxes, commute, and more at once? Use the live map to build a custom match.

Data comes from public sources. Source attribution and the exact data vintage are shown above and on the full map of flood risk.

Frequently asked questions

Which county in Oregon has the lowest flood risk?: Multnomah has the lowest flood risk in Oregon, at 36.2.
What is the flood risk in Multnomah?: Multnomah is ranked #1 in Oregon for flood risk, at 36.2.
What are the top counties in Oregon for flood risk?: Multnomah (36.2), then Washington (42.3), and Union (47.8). The full top 25 is in the table on this page.
How is this flood risk ranking calculated?: Counties in Oregon are ranked by flood risk (FEMA National Risk Index, FEMA NRI v1.20), lowest first. Values describe the county, not an individual property. Source vintage is shown on the page.
How does Oregon compare to the rest of the US for flood risk?: This list is Oregon only. See the national ranking of the lowest counties for flood risk at hearthmap.app/best/lowest-flood-risk.