Yes. Go to the National Archives Web site. The pics prove it. Yes, they did. There were at least two all-black Marine companies, the 11th Marine Depot Company and the 7th Marine Ammunition Company, according to this article written by the National Park Service for a commemorative series on African-American involvement in WWII.
http://www.nps.gov/archive/wapa/indepth/extContent/usmc/pcn-190-003132-00/sec10.htm
The article elaborates on specific involvement for these and other companies that included black soldiers, and what their particular actions involved. So, yes, African-Americans fought at Iwo Jima.
For further evidence, this webpage has photographs of black soldiers at Iwo Jima and detailed captions:
http://www.archives.gov/research/african-americans/ww2-pictures/
These three pictures from that page reveal the actions of black Marines on the island:
http://www.archives.gov/research/african-americans/ww2-pictures/images/african-americans-wwii-013.jpg
'13. "Seeking to rescue a Marine who was drowning in the surf at Iwo Jima, this sextet of Negro soldiers narrowly missed death themselves when their amphibian truck was swamped by heavy seas. From left to right, back row, they are T/5 L. C. Carter, Jr., Private John Bonner, Jr., Staff Sergeant Charles R. Johnson. Standing, from left to right, are T/5 A. B. Randle, T/5 Homer H. Gaines, and Private Willie Tellie." March 11, 1945. S/Sgt. W. H. Feen. 127-N-114329'
http://www.archives.gov/research/african-americans/ww2-pictures/images/african-americans-wwii-102.jpg
'102. "Iwo Jima...Negro Marines on the beach at Iwo Jima are, from left to right, Pfcs. Willie J. Kanody, Elif Hill, and John Alexander." March 1945. C. Jones. 127-N-11383. '
http://www.archives.gov/research/african-americans/ww2-pictures/images/african-americans-wwii-110.jpg
'110. "Carrying a Jap[anese] prisoner from stockade to be evacuated and treated for malnutrition. Iwo Jima." February 23, 1945. Don Fox. 127-N-110622.'
6,821
How big is Iwo Jima in acres
The island of Iwo Jima is known as "sulfur island" .
Iwo Jima was a possession of Japan since about 1862.
The battle of Iwo Jima officially ended on March 25,1945.
The Battle of Iwo Jima: (19 February-26 March 1945)
Approximately 880 boats were used during the battle for Iwo Jima.
The Japs on Iwo did not allow Americans to get killed, they killed them.
The Japanese vs the Americans
Approximately 70,000 .
no
6,821
The Japanese impressed Americans with their resolve to fight to the last man even when defeat was certain.
The Americans and Allied Forces won the battle of Iwo Jima and most of the battles to take back the islands on the island hopping campaign.
The Marines raised the US flag on the top of Mt Suribachi in the Battle for Iwo Jima.
Shootout - 2005 Iwo Jima Fight to the Death 2-1 was released on: USA: 3 November 2006
I believe I've read that 16 Medals of Honor were earned by Americans during the Battle of Iwo Jima.