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Counties with the Highest Natural Hazard Risk in Illinois

The top 25 of 102 Illinois counties on GIS Map, ranked by FEMA National Risk Index score (0-100, national percentile).

#CountyRisk Index score
1Cook County
100.0
2DuPage County
97.6
3Will County
97.3
4Lake County
96.0
5St. Clair County
94.9
6Kane County
94.6
7Madison County
93.4
8Winnebago County
92.4
9Sangamon County
91.7
10McHenry County
90.8
11Peoria County
90.7
12Champaign County
90.5
13Kankakee County
88.2
14Jackson County
87.1
15McLean County
86.9
16LaSalle County
86.1
17Williamson County
85.8
18Tazewell County
84.2
19Rock Island County
84.1
20Macon County
83.3
21Franklin County
80.9
22DeKalb County
80.8
23Kendall County
80.2
24Macoupin County
79.9
25Vermilion County
78.8

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 Illinois”, https://gismap.land/rankings/illinois/highest-risk-counties. Figures from FEMA National Risk Index (December 2025).

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