riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Marathon County Disaster Risk

Marathon County, Wisconsin

FEMA Risk Rating

Relatively Moderate

NRI score (0–100 relative scale)

87.2

FEMA composite county value

State Rank

#5

of 72, sorted high to low by RiskByCounty

Flood NRI score

87.7

higher coastal/inland value

Hazard Risk Breakdown

Five selected hazard categories out of FEMA's 18. Values are FEMA NRI v1.20 scores on a 0–100 relative scale.

Flood

87.7 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (87.7) NRI scores.

Tornado

83.8 / 100

Wildfire

40.1 / 100

Earthquake

18.0 / 100

Hurricane

0.0 / 100

FEMA NRI data summary

Selected hazard scores for Marathon County

Among the five hazard categories displayed by RiskByCounty, flood has the highest NRI score for this county.

Flood
87.7
Tornado
83.8
Wildfire
40.1
Earthquake
18.0
Hurricane
0.0

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
87.7
Coastal Flooding
Not available
Inland Flooding
87.7

These five categories are a selected subset of FEMA's 18 natural hazards. FEMA's composite score and official rating are separate fields in the National Risk Index dataset.

FEMA National Risk Index documentation

Official Ready.gov resource

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Frequently Asked Questions

How many Wisconsin county records are included?
RiskByCounty includes 72 Wisconsin county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Wisconsin?
FEMA NRI v1.20 (December 2025) county rating counts for Wisconsin: Very Low: 15; Relatively Low: 47; Relatively Moderate: 9; Relatively High: 1; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Wisconsin?
FEMA NRI v1.20 (December 2025) availability among 72 county records: Flood: 72 of 72; Wildfire: 72 of 72; Tornado: 72 of 72; Earthquake: 72 of 72; Hurricane: 66 of 72. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Marathon County, WI?
Marathon County has an official FEMA NRI v1.20 composite rating of Relatively Moderate and an NRI score (0–100 relative scale) of 87.2. RiskByCounty ranks it 5th of 72 Wisconsin county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Marathon County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Marathon County, Flood: 87.7; Tornado: 83.8; Wildfire: 40.1; Earthquake: 18.0; Hurricane: 0.0.
How is flood displayed for Marathon County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Marathon County, Coastal Flooding is Not available, Inland Flooding is 87.7, and the displayed flood score is 87.7.

Counties with Similar Risk

Winnebago County

Wisconsin

-0.3

Relatively Moderate

NRI score 86.8

Rock County

Wisconsin

-0.8

Relatively Moderate

NRI score 86.4

Racine County

Wisconsin

-1.7

Relatively Moderate

NRI score 85.4

Published by RiskByCounty

County summaries are deterministic transformations of frozen FEMA county fields. No external subject-matter reviewer is credited.

Published · Updated

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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