Why the official 9/11 death toll is 2,977

The September 11, 2001 attacks killed 2,977 people from 90 nations, according to the National September 11 Memorial & Museum, a total that deliberately excludes the 19 al-Qaeda hijackers who seized four airliners that morning. Count them and the day’s dead reach 2,996; read the names around the memorial pools in Manhattan and you will find 2,983.

The official figure is built from three sites, with each plane’s passengers and crew counted where their flight came down:

Site	Victims
New York: Twin Towers and Flights 11 and 175	2,753
Pentagon, including Flight 77	184
Flight 93, near Shanksville, Pennsylvania	40
All three sites	2,977

That bookkeeping is why other official numbers look different. The 9/11 Commission’s 2004 report grouped the dead differently, putting everyone aboard the four planes in a category of their own: more than 2,600 at the World Trade Center, 125 inside the Pentagon and 256 on the planes. Those rounder figures do not map neatly onto the memorial’s three-site count.

Among the 2,977 were 441 first responders, the largest loss of emergency workers on a single day in American history.

The extra six names on the memorial belong to an earlier attack. On February 26, 1993, terrorists linked to an Islamist extremist group detonated a van bomb beneath the World Trade Center, killing six people and injuring thousands. The memorial honours both groups together.

The 2,977 also stops at the day itself. Hundreds of thousands of responders, workers and residents breathed the toxic dust and smoke at and around Ground Zero, and the museum says the resulting illnesses have caused thousands of further deaths. Since 2019 a separate 9/11 Memorial Glade has honoured them. The federal September 11th Victim Compensation Fund has awarded more than $16.8 billion to over 71,000 claimants since it reopened in October 2011, so the attack’s human cost is still being counted.