This is a list of known disasters that have occurred in New Hampshire, organized by death toll. Historically documented events that caused 10 or more deaths are included.

List Notes: Some of the events occurred prior to New Hampshire becoming a U.S. state. Acts of war are generally excluded, such as the French and Indian Wars, although specific localized events, such as the Raid on Oyster River, are included. Annual deaths from influenza ("flu season") are excluded unless they reached pandemic level per the New Hampshire Department of Health & Human Services (DHHS). Every flu season with a summary report available online from DHHS—currently 2012–2013 through 2019–2020—had at least 10 "influenza-associated" deaths in New Hampshire. Some of the events occurred in the Atlantic Ocean, at varying distances from land (such distances, when known, are provided via footnote).

YearEventTypeDeath tollLocationSources 1918 Spanish flu pandemic Disease 3,907 statewide 2020 COVID-19 pandemic Disease 2,972 statewide 1694 Raid on Oyster River Massacre 104 Durham 1893 Strafford County Farm fire Fire 41 Dover 1941 Sinking of the Shipwreck 33 off Portsmouth 1968 Northeast Airlines Flight 946 Aviation accident 32 Etna 1907 Canaan train wreck Railway collision 26 Canaan 1939 Sinking of the USS Squalus Shipwreck 26 off Seabrook 1689 Raid on Dover Massacre 23 Dover 1689 Raid on Huckins' Garrison Massacre 18 Durham 1689 Raid on Sandy Beach Massacre 16 Rye 1696 Raid on Portsmouth Plain Massacre 14 Portsmouth 1881 Strafford County Farm fire Fire 13 Dover 1938 1938 New England hurricane Weather 13 statewide 1944 Army Air Force B-24 crash Aviation accident 10 Epsom

Disasters with incomplete information The New Hampshire death tolls for these regional events, which are known to have caused 10 or more deaths in the neighboring state of Massachusetts, are currently lacking.

1896 Eastern North America heat wave – caused the deaths of at least four people in Nashua, and about 1,500 people in total 1911 Eastern North America heat wave – caused the deaths of 380 to 2000 people in total

Disasters not included These notable events are not included in the main list, but have some association with New Hampshire.

In April 1963, the USS Thresher (SSN-593) departed from Portsmouth Naval Shipyard in Kittery, Maine, and sank off the coast of Cape Cod, Massachusetts, resulting in the loss of 129 lives. In July 1973, Delta Air Lines Flight 723 crashed while attempting to land at Logan International Airport in Boston, resulting in 89 fatalities; the flight originated in Burlington, Vermont, and made an intermediate stop in Manchester before the incident.

Disasters at notable locations These events at notable New Hampshire locations had multiple fatalities, although fewer than 10, thus are not included in the main list.

In August 1826, a landslide near Willey House at Crawford Notch in the White Mountains resulted in nine deaths. In September 1967, eight passengers were killed and 72 injured after a locomotive of the Mount Washington Cog Railway derailed and a passenger car slid several hundred feet into a large rock.

See also List of accidents and disasters by death toll List of natural disasters by death toll List of disasters in Maine by death toll List of disasters in Massachusetts by death toll List of disasters in the United States by death toll

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