riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Michigan Disaster Risk

Natural disaster risk data for all 83 counties.

FEMA release

December 2025

Mean county NRI score

49.6

Counties with Data

83

of 83 total

County risk atlas

Michigan 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

83/83

Mean county NRI score

49.6

Risk layers

6

All Michigan Counties

CountyNRI score
Wayne County99.0
Oakland County97.5
Macomb County96.7
Kent County92.2
Genesee County92.2
Washtenaw County89.3
Saginaw County88.5
Ingham County87.2
Ottawa County82.9
Monroe County82.5
St. Clair County82.0
Berrien County81.7
Kalamazoo County81.7
Bay County78.2
Jackson County76.5
Calhoun County74.5
Livingston County73.5
Tuscola County73.1
Midland County71.9
Sanilac County70.3
Muskegon County70.1
Lenawee County69.9
Mecosta County69.8
Marquette County69.8
Allegan County68.5
Eaton County67.6
Lapeer County66.4
Isabella County66.1
Grand Traverse County65.6
Shiawassee County62.2
Van Buren County60.5
Cheboygan County59.5
Dickinson County59.3
Huron County59.0
St. Joseph County58.6
Montcalm County56.9
Roscommon County56.7
Ionia County55.9
Iron County55.1
Gratiot County54.1
Delta County53.1
Branch County51.8
Hillsdale County50.0
Leelanau County48.3
Cass County47.7
Clare County47.5
Newaygo County47.1
Clinton County47.0
Barry County46.0
Menominee County44.4
Gladwin County40.3
Emmet County38.1
Iosco County37.8
Manistee County37.2
Ogemaw County37.0
Wexford County33.9
Oceana County33.7
Alpena County28.3
Chippewa County26.3
Antrim County25.8
Gogebic County25.6
Mason County25.3
Houghton County24.3
Osceola County23.9
Benzie County22.7
Charlevoix County22.3
Lake County22.0
Presque Isle County21.8
Kalkaska County21.3
Arenac County20.3
Otsego County18.4
Crawford County18.0
Alcona County17.7
Montmorency County15.9
Oscoda County15.1
Missaukee County11.1
Baraga County10.7
Alger County9.6
Mackinac County9.1
Schoolcraft County6.7
Ontonagon County4.2
Luce County2.6
Keweenaw County0.7

Frequently Asked Questions

How many Michigan county records are included?
RiskByCounty includes 83 Michigan county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Michigan?
FEMA NRI v1.20 (December 2025) county rating counts for Michigan: Very Low: 33; Relatively Low: 37; Relatively Moderate: 10; Relatively High: 3; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Michigan?
FEMA NRI v1.20 (December 2025) availability among 83 county records: Flood: 83 of 83; Wildfire: 83 of 83; Tornado: 83 of 83; Earthquake: 83 of 83; Hurricane: 83 of 83. 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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