Counties with the Highest Natural Hazard Risk in New Hampshire
The top 10 of 10 New Hampshire counties on GIS Map, ranked by FEMA National Risk Index score (0-100, national percentile).
| # | County | Risk Index score |
|---|---|---|
| 1 | Hillsborough County | 89.8 |
| 2 | Rockingham County | 85.8 |
| 3 | Grafton County | 81.8 |
| 4 | Merrimack County | 78.2 |
| 5 | Coos County | 72.8 |
| 6 | Carroll County | 71.0 |
| 7 | Strafford County | 64.1 |
| 8 | Cheshire County | 60.5 |
| 9 | Belknap County | 57.4 |
| 10 | Sullivan County | 37.6 |
Source: FEMA National Risk Index (December 2025). All counties with data are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Counties with the Highest Natural Hazard Risk in New Hampshire”, https://gismap.land/rankings/new-hampshire/highest-risk-counties. Figures from FEMA National Risk Index (December 2025).
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