riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Illinois Disaster Risk

Natural disaster risk data for all 102 counties.

FEMA release

December 2025

Mean county NRI score

54.5

Counties with Data

102

of 102 total

County risk atlas

Illinois hazard exposure by county

FEMA NRI v1.20 scores on a 0–100 relative scale. Toggle the composite and five selected hazard categories out of FEMA's 18. Flood is the higher of Coastal Flooding and Inland Flooding NRI scores.

Counties

102/102

Mean county NRI score

54.5

Risk layers

6

All Illinois Counties

CountyNRI score
Cook County100.0
DuPage County97.6
Will County97.3
Lake County96.0
St. Clair County94.9
Kane County94.6
Madison County93.4
Winnebago County92.4
Sangamon County91.7
McHenry County90.8
Peoria County90.7
Champaign County90.5
Kankakee County88.2
Jackson County87.1
McLean County86.9
LaSalle County86.1
Williamson County85.8
Tazewell County84.2
Rock Island County84.1
Macon County83.3
Franklin County80.9
DeKalb County80.8
Kendall County80.2
Macoupin County79.9
Vermilion County78.8
Randolph County78.6
Jefferson County77.2
Marion County77.1
Iroquois County74.0
Stephenson County73.9
Perry County72.1
Livingston County71.8
Morgan County71.1
Ogle County71.1
Coles County70.4
Saline County70.1
Grundy County66.5
Whiteside County65.8
Clinton County65.6
Montgomery County65.4
Adams County64.2
Bureau County62.3
Douglas County62.1
Massac County61.6
Fulton County59.0
Logan County58.1
Boone County57.3
Knox County57.2
Henry County57.1
Union County55.4
Washington County55.2
Lee County54.4
White County54.3
Christian County54.0
Effingham County53.8
Shelby County51.7
Jo Daviess County51.3
Johnson County51.1
Lawrence County49.2
Pulaski County49.0
Fayette County48.8
Richland County46.7
Moultrie County45.0
Alexander County44.1
Mason County43.0
Monroe County41.9
Clay County41.1
Wayne County40.7
Woodford County39.9
Carroll County39.0
Cass County38.6
McDonough County37.5
Crawford County37.0
Bond County36.2
Piatt County35.0
Edgar County34.9
Gallatin County33.9
Hancock County31.1
Hamilton County30.8
Pike County30.3
De Witt County29.3
Menard County28.7
Clark County27.3
Marshall County27.2
Ford County26.2
Edwards County26.1
Cumberland County25.9
Wabash County24.8
Jasper County20.4
Jersey County18.9
Henderson County17.5
Warren County15.5
Pope County14.9
Greene County13.0
Schuyler County11.4
Putnam County9.2
Mercer County8.8
Hardin County8.3
Stark County7.3
Calhoun County6.1
Brown County4.7
Scott County2.8

Frequently Asked Questions

How many Illinois county records are included?
RiskByCounty includes 102 Illinois county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Illinois?
FEMA NRI v1.20 (December 2025) county rating counts for Illinois: Very Low: 37; Relatively Low: 45; Relatively Moderate: 14; Relatively High: 5; Very High: 1; Not available: 0.
How complete are the five selected hazard fields for Illinois?
FEMA NRI v1.20 (December 2025) availability among 102 county records: Flood: 102 of 102; Wildfire: 102 of 102; Tornado: 102 of 102; Earthquake: 102 of 102; Hurricane: 102 of 102. RiskByCounty displays five selected hazard categories out of FEMA's 18.

Official Ready.gov resource

Continue to Ready.gov for federal emergency-planning information maintained outside RiskByCounty.

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Data Source

County data sourced from FEMA National Risk Index v1.20, released December 2025. Values are labeled NRI score (0–100 relative scale). RiskByCounty displays five selected hazard categories out of FEMA's 18; flood is the higher of the Coastal Flooding and Inland Flooding source scores.

RiskByCounty presents county-level source fields and deterministic arithmetic summaries.

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