NHTSA FARS 2020–2024 · Census population
Most Dangerous Counties in New Hampshire
Quick answer: Hillsborough County recorded the most road deaths in New Hampshire from 2020 to 2024 (137), while Carroll County had the highest death rate, 18.9 per 100,000 residents a year against 9 for the state as a whole.
Per 100,000 residents a year · counties with 10,000+ people
Highest death rate
| # | County | Deaths per 100k / year | Deaths 2020–2024 | Population |
|---|---|---|---|---|
| 1 | Carroll County | 18.9 | 49 | 51,804 |
| 2 | Belknap County | 13.9 | 45 | 64,659 |
| 3 | Merrimack County | 11.7 | 91 | 155,967 |
| 4 | Coos County | 10.9 | 17 | 31,270 |
| 5 | Cheshire County | 10.3 | 40 | 77,297 |
| 6 | Grafton County | 10.2 | 47 | 92,120 |
| 7 | Strafford County | 10 | 66 | 132,575 |
| 8 | Sullivan County | 8.7 | 19 | 43,715 |
| 9 | Rockingham County | 7.3 | 117 | 319,082 |
| 10 | Hillsborough County | 6.4 | 137 | 426,378 |
10 counties · click a heading to sort
Every county in New Hampshire
| County | Deaths | Fatal crashes | Per 100k / yr | Pedestrians | At night | Alcohol | 2020→2024 | Deadliest roads |
|---|---|---|---|---|---|---|---|---|
| Hillsborough County | 137 | 128 | 6.4 | 10% | 42% | 36% | I-293, US-3, SR-28 | |
| Rockingham County | 117 | 109 | 7.3 | 6% | 36% | 36% | I-93, SR-101, SR-111 | |
| Merrimack County | 91 | 86 | 11.7 | 14% | 37% | 35% | US-3, I-93, SR-3A | |
| Strafford County | 66 | 60 | 10 | 14% | 40% | 42% | US-202, SR-125, SR-4 | |
| Carroll County | 49 | 44 | 18.9 | 8% | 39% | 34% | SR-16, SR-109, US-302 | |
| Grafton County | 47 | 43 | 10.2 | 9% | 33% | 40% | I-93, US-302, SR-118 | |
| Belknap County | 45 | 40 | 13.9 | 20% | 25% | 28% | US-3, SR-11, I-93 | |
| Cheshire County | 40 | 36 | 10.3 | 2% | 33% | 36% | SR-12, SR-9, SR-10 | |
| Sullivan County | 19 | 17 | 8.7 | 11% | 35% | 12% | SR-11, SR-12, SR-103 | |
| Coos County | 17 | 17 | 10.9 | 6% | 29% | 29% | SR-16, US-3, US-2 |
Deaths = people killed in crashes in the county, 2020–2024. Pedestrians = share of deaths who were on foot. At night = share of fatal crashes in the dark. Alcohol = share of fatal crashes where police reported a driver had been drinking. Rate = yearly average deaths ÷ average population × 100,000. Source: NHTSA FARS, U.S. Census Bureau.
More for New Hampshire: deadliest highways and roads · New Hampshire accidents today · get a police report · every state
Questions
Dangerous counties — FAQ
What is the most dangerous county in New Hampshire for driving?
Hillsborough County recorded the most road deaths in New Hampshire from 2020 to 2024 (137), while Carroll County had the highest death rate, 18.9 per 100,000 residents a year against 9 for the state as a whole. Big counties lead on counts because more people drive there; the rate shows the risk for each resident.
How many people died on New Hampshire roads from 2020 to 2024?
628 people, according to NHTSA's Fatality Analysis Reporting System, about 126 a year.
Where does this ranking come from?
Every fatal crash in NHTSA's FARS census for 2020–2024, placed in the county where it happened, divided by the county's average population from the U.S. Census Bureau. Rates are only ranked for counties with at least 10,000 residents.