FEMA NRI v1.20Released December 2025Methodology

New Hampshire Disaster Risk

Natural disaster risk data for all 10 counties.

FEMA release

December 2025

Mean county NRI score

69.9

Counties with Data

of 10 total

County risk atlas

New Hampshire 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

10/10

Mean county NRI score

69.9

Risk layers

Highest Risk Counties

Hillsborough County

Relatively Moderate

NRI score 89.8

Rockingham County

Relatively Moderate

NRI score 85.8

Grafton County

Relatively Moderate

NRI score 81.8

Merrimack County

Relatively Low

NRI score 78.2

Coos County

Relatively Low

NRI score 72.8

Lowest Risk Counties

Sullivan County

Very Low

NRI score 37.6

Belknap County

Relatively Low

NRI score 57.4

Cheshire County

Relatively Low

NRI score 60.5

Strafford County

Relatively Low

NRI score 64.1

Carroll County

Relatively Low

NRI score 71.0

All New Hampshire Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Hillsborough County	89.8	Relatively Moderate	92.6	67.0	82.6	88.2
Rockingham County	85.8	Relatively Moderate	92.8	47.8	73.5	87.5
Grafton County	81.8	Relatively Moderate	90.1	30.9	24.4	69.6
Merrimack County	78.2	Relatively Low	85.8	35.2	56.2	76.1
Coos County	72.8	Relatively Low	77.6	16.4	10.6	49.0
Carroll County	71.0	Relatively Low	82.0	33.6	18.9	62.8
Strafford County	64.1	Relatively Low	76.0	34.5	42.2	77.4
Cheshire County	60.5	Relatively Low	74.8	24.5	43.6	58.0
Belknap County	57.4	Relatively Low	70.3	25.3	31.4	59.8
Sullivan County	37.6	Very Low	60.6	13.7	22.7	43.1

Frequently Asked Questions

How many New Hampshire county records are included?

RiskByCounty includes 10 New Hampshire county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in New Hampshire?

FEMA NRI v1.20 (December 2025) county rating counts for New Hampshire: Very Low: 1; Relatively Low: 6; Relatively Moderate: 3; Relatively High: 0; Very High: 0; Not available: 0.

How complete are the five selected hazard fields for New Hampshire?

FEMA NRI v1.20 (December 2025) availability among 10 county records: Flood: 10 of 10; Wildfire: 10 of 10; Tornado: 10 of 10; Earthquake: 10 of 10; Hurricane: 10 of 10. 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.

Visit Ready.gov →

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.

← Back to All States

Explore more data for New Hampshire

Property Tax Cost of Living Crime Rate Income Health Schools Water Quality Weather County Score