Which county in Idaho has the lowest flood risk?

Bannock has the lowest flood risk in Idaho, at 27.6.

What is the flood risk in Bannock?

Bannock is ranked #1 in Idaho for flood risk, at 27.6.

What are the top counties in Idaho for flood risk?

Bannock (27.6), then Ada (29.4), and Canyon (33.1). The full top 25 is in the table on this page.

How is this flood risk ranking calculated?

Counties in Idaho 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 Idaho compare to the rest of the US for flood risk?

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

Lowest Flood Risk Counties in Idaho (2026)

Lowest counties for flood risk in Idaho

Top 25 of 44 counties with data.

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

Lowest counties for flood risk in Idaho

Rank	County	Value
01	Bannock27.6 County page
02	Ada29.4 County page
03	Canyon33.1 County page
04	Twin Falls38.6 County page
05	Clark44.2 County page
06	Jerome45.2 County page
07	Elmore47.0 County page
08	Camas51.8 County page
09	Teton51.8 County page
10	Madison53.0 County page
11	Kootenai55.1 County page
12	Bear Lake55.5 County page
13	Minidoka57.0 County page
14	Nez Perce60.1 County page
15	Jefferson60.5 County page
16	Gooding60.5 County page
17	Power61.3 County page
18	Latah61.3 County page
19	Oneida64.3 County page
20	Bonneville65.2 County page
21	Lewis65.4 County page
22	Bingham70.3 County page
23	Caribou72.1 County page
24	Payette75.3 County page
25	Fremont76.6 County page

How this ranking works

This page ranks Idaho 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 Idaho has the lowest flood risk?: Bannock has the lowest flood risk in Idaho, at 27.6.
What is the flood risk in Bannock?: Bannock is ranked #1 in Idaho for flood risk, at 27.6.
What are the top counties in Idaho for flood risk?: Bannock (27.6), then Ada (29.4), and Canyon (33.1). The full top 25 is in the table on this page.
How is this flood risk ranking calculated?: Counties in Idaho 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 Idaho compare to the rest of the US for flood risk?: This list is Idaho only. See the national ranking of the lowest counties for flood risk at hearthmap.app/best/lowest-flood-risk.