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RankingsIdahoHighest hazard risk counties

Counties with the Highest Natural Hazard Risk in Idaho

The top 25 of 44 Idaho counties on GIS Map, ranked by FEMA National Risk Index score (0-100, national percentile).

#CountyRisk Index score
1Ada County
87.8
2Bonneville County
82.4
3Kootenai County
79.0
4Idaho County
78.4
5Bonner County
77.3
6Canyon County
71.7
7Bannock County
66.9
8Blaine County
65.4
9Shoshone County
62.8
10Bingham County
60.1
11Madison County
58.6
12Valley County
55.6
13Custer County
52.4
14Elmore County
52.0
15Boise County
48.9
16Clearwater County
46.9
17Twin Falls County
46.9
18Owyhee County
44.1
19Cassia County
43.6
20Lemhi County
41.4
21Jefferson County
40.1
22Adams County
39.6
23Fremont County
38.3
24Gem County
34.4
25Latah County
33.3

Source: FEMA National Risk Index (December 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Natural Hazard Risk in Idaho”, https://gismap.land/rankings/idaho/highest-risk-counties. Figures from FEMA National Risk Index (December 2025).

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