New Hampshire Natural Disaster Risk by County
FEMA National Risk Index rankings for all 10 counties
New Hampshire spans 10 counties with an average FEMA National Risk Index score of 69.9 (high risk) and roughly $463M in combined expected annual loss statewide. No county in the state reaches the High risk band.
Topping the rankings is Hillsborough County (score 89.8, medium), while Sullivan County (score 37.6) carries the lowest. Use the table below to compare every county by score, top hazard, and expected annual loss.
County Rankings
| # | County | Risk Score | Risk Rating | Top Hazard | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Hillsborough County | Medium | Ice Storm | $120M | |
| 2 | Rockingham County | Medium | Coastal Flood | $90M | |
| 3 | Grafton County | Medium | Landslide | $50M | |
| 4 | Merrimack County | Low | Ice Storm | $49M | |
| 5 | Coos County | Low | Avalanche | $27M | |
| 6 | Carroll County | Low | Winter Weather | $31M | |
| 7 | Strafford County | Low | Ice Storm | $29M | |
| 8 | Cheshire County | Low | Landslide | $27M | |
| 9 | Belknap County | Low | Lightning | $24M | |
| 10 | Sullivan County | Very Low | Landslide | $15M |
All 10 New Hampshire counties, ranked by FEMA National Risk Index score.
Frequently Asked Questions
Which New Hampshire county has the highest natural disaster risk?
Hillsborough County has the highest FEMA National Risk Index score in New Hampshire at 89.8 (Medium), driven largely by ice storm.
What is the average natural disaster risk in New Hampshire?
New Hampshire counties average a National Risk Index score of 69.9 across 10 counties, with 0 rated High or Very High risk.
How much are expected annual losses across New Hampshire?
FEMA estimates roughly $463M in combined expected annual loss from natural hazards across all New Hampshire counties.