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RankingsIowaLowest hazard risk counties

Counties with the Lowest Natural Hazard Risk in Iowa

The top 25 of 99 Iowa counties on GIS Map, ranked by lowest FEMA National Risk Index score (0-100, national percentile).

#CountyRisk Index score
1Worth County
9.9
2Monroe County
10.3
3Grundy County
13.1
4Ringgold County
14.2
5Osceola County
14.9
6Fremont County
15.0
7Palo Alto County
15.5
8Howard County
15.6
9O'Brien County
16.4
10Louisa County
17.5
11Clarke County
18.4
12Ida County
18.4
13Mills County
18.5
14Lyon County
19.2
15Adams County
20.4
16Cedar County
21.5
17Franklin County
21.9
18Keokuk County
21.9
19Wayne County
22.0
20Shelby County
22.8
21Decatur County
23.6
22Buchanan County
24.0
23Humboldt County
24.1
24Bremer County
24.6
25Monona County
25.1

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 Lowest Natural Hazard Risk in Iowa”, https://gismap.land/rankings/iowa/lowest-risk-counties. Figures from FEMA National Risk Index (December 2025).

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