FEMA NRI v1.20Released December 2025Methodology

Ohio Disaster Risk

Natural disaster risk data for all 88 counties.

FEMA release

December 2025

Mean county NRI score

55.0

Counties with Data

of 88 total

County risk atlas

Ohio 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

88/88

Mean county NRI score

55.0

Risk layers

Highest Risk Counties

Franklin County

Relatively High

NRI score 98.1

Cuyahoga County

Relatively High

NRI score 98.0

Hamilton County

Relatively High

NRI score 96.3

Montgomery County

Relatively Moderate

NRI score 92.7

Lucas County

Relatively Moderate

NRI score 92.4

Lowest Risk Counties

Harrison County

Very Low

NRI score 11.4

Vinton County

Very Low

NRI score 11.8

Noble County

Very Low

NRI score 13.5

Wyandot County

Very Low

NRI score 17.4

Morgan County

Very Low

NRI score 18.2

All Ohio Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Franklin County	98.1	Relatively High	98.8	29.1	98.4	93.3
Cuyahoga County	98.0	Relatively High	98.7	56.9	99.0	89.6
Hamilton County	96.3	Relatively High	96.9	47.3	99.4	92.7
Montgomery County	92.7	Relatively Moderate	95.5	44.1	92.6	91.1
Lucas County	92.4	Relatively Moderate	95.4	36.5	97.3	88.1
Butler County	91.5	Relatively Moderate	93.0	41.2	98.0	85.3
Summit County	91.2	Relatively Moderate	94.0	53.2	91.1	78.3
Stark County	87.9	Relatively Moderate	91.7	49.0	87.7	78.8
Lorain County	86.3	Relatively Moderate	90.2	45.9	90.9	74.6
Trumbull County	84.5	Relatively Moderate	88.8	43.7	90.8	69.2
Mahoning County	83.6	Relatively Moderate	88.1	48.6	91.2	73.3
Licking County	78.9	Relatively Low	86.0	42.5	61.5	65.9
Delaware County	78.8	Relatively Low	86.4	26.7	81.5	66.2
Clermont County	77.9	Relatively Low	81.3	41.4	83.6	78.4
Warren County	77.8	Relatively Low	83.9	37.7	83.4	75.5
Lake County	77.4	Relatively Low	86.1	28.9	75.2	60.9
Clark County	77.1	Relatively Low	84.2	25.0	82.3	78.8
Greene County	75.7	Relatively Low	75.4	30.8	81.3	80.3
Belmont County	75.2	Relatively Low	87.0	40.7	55.5	41.3
Allen County	73.3	Relatively Low	83.0	9.4	74.3	83.2
Fairfield County	72.6	Relatively Low	81.8	26.3	71.6	57.2
Lawrence County	71.0	Relatively Low	83.7	53.2	48.3	48.7
Muskingum County	70.9	Relatively Low	83.8	33.6	56.3	51.8
Scioto County	70.2	Relatively Low	82.0	34.2	45.0	62.6
Columbiana County	69.1	Relatively Low	82.2	46.8	70.0	42.5
Tuscarawas County	69.0	Relatively Low	82.3	38.3	46.6	54.9
Medina County	69.0	Relatively Low	75.5	46.6	84.6	47.6
Athens County	68.7	Relatively Low	83.7	13.4	37.4	48.8
Jefferson County	66.7	Relatively Low	81.6	40.5	50.2	46.3
Wood County	65.7	Relatively Low	75.7	13.5	80.5	69.8
Portage County	65.1	Relatively Low	75.3	39.2	70.5	53.3
Wayne County	64.9	Relatively Low	71.9	38.8	76.1	56.5
Washington County	64.4	Relatively Low	80.5	22.6	33.1	47.1
Ross County	62.9	Relatively Low	74.5	48.5	56.3	53.8
Ashtabula County	62.6	Relatively Low	72.6	36.1	78.8	54.7
Brown County	62.6	Relatively Low	75.0	60.7	57.5	65.8
Miami County	61.4	Relatively Low	70.1	21.0	75.4	80.4
Erie County	61.4	Relatively Low	71.8	23.0	77.9	62.1
Richland County	61.3	Relatively Low	71.6	35.6	62.3	56.2
Marion County	61.1	Relatively Low	64.9	3.7	62.9	69.1
Knox County	61.0	Relatively Low	72.0	36.2	64.3	48.5
Holmes County	60.4	Relatively Low	71.2	46.9	66.7	41.9
Geauga County	60.3	Relatively Low	73.3	42.3	59.6	46.2
Ottawa County	59.2	Relatively Low	72.6	14.0	72.8	52.9
Sandusky County	56.7	Relatively Low	67.7	6.4	71.4	62.2
Shelby County	56.2	Relatively Low	63.3	10.3	68.5	86.5
Hancock County	54.1	Relatively Low	65.4	1.9	67.3	60.6
Logan County	53.2	Relatively Low	67.7	6.7	61.2	69.2
Meigs County	53.0	Relatively Low	72.7	8.4	25.5	40.2
Darke County	52.7	Relatively Low	60.1	12.3	81.8	80.1
Pickaway County	50.9	Relatively Low	66.0	18.6	52.9	54.0
Huron County	50.3	Relatively Low	60.5	15.7	67.3	52.6
Coshocton County	49.1	Relatively Low	66.8	29.9	46.8	32.1
Gallia County	48.3	Relatively Low	67.6	34.8	26.1	43.3
Hocking County	47.3	Relatively Low	68.8	12.7	33.8	34.6
Seneca County	46.9	Relatively Low	61.2	2.8	58.0	57.1
Ashland County	46.3	Relatively Low	60.2	30.0	57.3	43.9
Williams County	44.4	Relatively Low	51.8	12.1	74.4	63.0
Adams County	43.8	Relatively Low	64.3	63.0	41.2	49.4
Preble County	43.3	Relatively Low	51.4	13.6	76.7	63.2
Highland County	43.2	Relatively Low	56.6	60.3	56.2	62.0
Pike County	43.1	Relatively Low	63.9	24.2	37.4	43.3
Defiance County	41.9	Very Low	59.4	6.9	63.7	52.6
Auglaize County	41.8	Very Low	55.5	5.2	58.0	77.2
Guernsey County	37.5	Very Low	58.9	31.1	36.8	38.5
Jackson County	35.8	Very Low	57.2	20.4	33.9	45.5
Crawford County	35.2	Very Low	51.9	3.1	42.0	52.0
Clinton County	34.0	Very Low	44.7	8.9	55.5	65.4
Henry County	33.8	Very Low	55.1	3.5	48.5	53.0
Fulton County	33.6	Very Low	41.7	8.1	66.9	58.7
Putnam County	32.9	Very Low	52.8	2.3	48.5	53.6
Union County	32.7	Very Low	52.7	4.1	49.5	48.6
Mercer County	31.6	Very Low	42.1	6.5	67.0	73.8
Monroe County	27.3	Very Low	50.9	18.3	23.9	33.0
Champaign County	26.7	Very Low	43.8	3.4	46.4	56.2
Perry County	26.0	Very Low	47.0	18.4	32.4	36.2
Fayette County	25.9	Very Low	42.5	5.1	43.3	57.7
Madison County	24.9	Very Low	41.5	2.9	43.9	55.6
Hardin County	24.4	Very Low	40.2	1.3	36.3	48.9
Morrow County	24.4	Very Low	45.0	16.4	40.6	39.9
Paulding County	21.2	Very Low	39.2	4.4	51.2	50.3
Van Wert County	20.1	Very Low	33.7	3.4	48.2	57.0
Carroll County	19.9	Very Low	42.8	24.7	28.0	27.0
Morgan County	18.2	Very Low	45.3	11.2	17.0	24.7
Wyandot County	17.4	Very Low	30.5	1.0	40.5	45.5
Noble County	13.5	Very Low	35.8	22.6	24.7	28.7
Vinton County	11.8	Very Low	34.6	4.0	21.3	28.1
Harrison County	11.4	Very Low	27.3	17.0	18.2	23.8

Frequently Asked Questions

How many Ohio county records are included?

RiskByCounty includes 88 Ohio county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in Ohio?

FEMA NRI v1.20 (December 2025) county rating counts for Ohio: Very Low: 26; Relatively Low: 51; Relatively Moderate: 8; Relatively High: 3; Very High: 0; Not available: 0.

How complete are the five selected hazard fields for Ohio?

FEMA NRI v1.20 (December 2025) availability among 88 county records: Flood: 88 of 88; Wildfire: 88 of 88; Tornado: 88 of 88; Earthquake: 88 of 88; Hurricane: 88 of 88. 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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