Flood Risk by County in New Hampshire

New Hampshire: 10 counties covered

Across 10 New Hampshire counties with a FEMA flood score, the average national percentile is 80.3, but that average hides real spread between counties, which is why each one gets its own page rather than a single statewide number.

• Hillsborough County, 92.6th percentile, Relatively Moderate
• Rockingham County, 92.8th percentile, Relatively High
• Merrimack County, 85.8th percentile, Relatively Moderate
• Strafford County, 76th percentile, Relatively Moderate
• Grafton County, 90.1th percentile, Relatively Moderate
• Cheshire County, 74.8th percentile, Relatively Moderate
• Belknap County, 70.3th percentile, Relatively Low
• Carroll County, 82th percentile, Relatively Moderate
• Sullivan County, 60.6th percentile, Relatively Low
• Coos County, 77.6th percentile, Relatively Moderate