On September 11, 2001, a total of 125 people died inside the Pentagon when American Airlines Flight 77 crashed into it. These included 70 civilians and 55 military personnel. Additionally, 59 passengers and crew members on Flight 77 died, bringing the total number of deaths related to the Pentagon attack to 184.

Breakdown of Pentagon Casualties

• 125 Pentagon workers died (70 civilians, 55 military personnel)
• 59 passengers and crew on Flight 77 died
• Total deaths related to the Pentagon attack: 184

Among those who died in the Pentagon were many military personnel, as well as civilians working in defense-related roles. The highest-ranking military official killed was Lieutenant General Timothy Maude. Thus, the number of people who died inside the Pentagon itself on 9/11 was 125, with a total of 184 deaths when including the passengers and crew aboard the hijacked plane that struck the building.