This is the subject of some debate. Estimates have ranged everywhere from 26 to 1200. The one partial list of names of Muslims who are known to have died as victims of the 9/11 attacks puts it closer to around 60. This information came from About.com.

Not counting the 19 terrorists themselves (who at best can be called "fringe" Muslims), there are several dozen of the victims who were known to follow Islam, and likely several dozen more amongst the variety of ordinary citizens killed in the attack.

19 Muslims who committed suicide by crashing planes in the World Trade Center towers, the Pentagon, and Sharksville, Pennsylvania where 4 terrorist miss their targets.

According to the BBC: among those killed in the Twin Towers were an estimated 70 Muslims. One of those was Briton Sarah Ali. This does not include the 19 hijackers.

According to the View, 70

1. Shabbir Ahmed - 47 years old - Windows on the World Restaurant
2. Tariq Amanullah - 40 years old - Fiduciary Trust Co.
3. Michael Baksh - 36 years old - Marsh & McLennan
4. Touri Hamzavi Bolourchi - 69 years old - retired nurse on United #175
5. Abul K. Chowdhury - 30 years old - Cantor Fitzgerald
6. Mohammad Salahuddin Chowdhury - 38 years old - Windows on the World
7. Jemal Legesse De Santis - 28 years old - World Trade Center
8. Simon Suleman Ali Kassamali Dhanani - 63 years old - Aon Corp.
9. Syed Abdul Fatha - 54 years old - Pitney Bowes
10. Mon Gjonbalaj - 65 years old - Janitor, World Trade Center
11. Nezam A. Hafiz - 32 years old - Marsh & McLennan
12. Mohammed Salman Hamdani - 23 years old - NYPD Cadet
13. Zuhtu Ibis - 25 years old - Cantor Fitzgerald
14. Muhammadou Jawara - 30 years old - MAS Security
15. Sarah Khan - 32 years old - Forte Food Service
16. Taimour Firaz Khan - 29 years old - Carr Futures
17. Abdoulaye Kone - 37 years old - Windows on the World
18. Abdu Ali Malahi - 37 years old - WTC MarriottNurul Hoque Miah - 35 years old - Marsh & McLennan
19. Boyie Mohammed - 50 years old - Carr Futures
20. Ehtesham U. Raja - 28 years old - TCG Software
21. Ameenia Rasool - 33 years old - Marsh & McLennan
22. Mohammad Ali Sadeque - 62 years old - newspaper vendor at WTC, reported missing
23. Rahma Salie & child - 28 years old (7 months pregnant) - American #11
24. Khalid M. Shahid - 25 years old - Cantor Fitzgerald
25. Mohammed Shajahan - 41 years old - Marsh & McLennan
26. Nasima Hameed Simjee - 38 years old - Fiduciary Trust Co.
27. Michael Theodoridis - 32 years old - American #11
28. Abdoul Karim Traore - 41 years old - Windows on the World
29. Karamo Trerra - 40 years old - ASAP NetSource
30. Shakila Yasmin - 26 years old - Marsh & McLennan