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between 70,000 and 80,000 US Marines participated in the battle.
in all theaters in WWII, the USMC endured nearly 87,000 casualties, including 24,511 killed (either in action or of their wounds).
at Iwo Jima, the USMC endured 6,102 killed (either in action or of their wounds), or nearly 25% of all US Marines killed in WWII.
in WWII, US servicement earned 472 Medals of Honor, 82 by US Marines.
at Iwo Jima, Marines earned 27 Medals of Honor, nearly 6% of the WWII total, and nearly 33% of the WWII total by US Marines.
407,316 US servicepeople died in WWII, the USMC losses on Iwo Jima account for nearly 1.5% of that total.

WWII USMC Medal of Honor (alpha order)

Private First Class Harold Christ Agerholm
Private First Class Richard Beatty Anderson
Major Kenneth D. Bailey
Sergeant John Basilone
Lieutenant Colonel Harold William Bauer
Corporal Lewis Kenneth Bausell
Corporal Charles Joseph Berry
First Lieutenant Alexander Bonnyman, Jr.
Staff Sergeant William James Bordelon
Major Gregory Boyington
Corporal Richard Earl Bush
Private First Class William Robert Caddy
First Lieutenant George Ham Cannon
Corporal Anthony Casemento
Lieutenant Colonel Justice Marion Chambers
Sergeant Darrell Samuel Cole
Major Henry Alexius Courtney, Jr.
Corporal Anthony Peter Damato
Corporal James L. Day
First Lieutenant Jefferson Joseph DeBlanc
Captain Robert Hugo Dunlap
Lieutenant Colonel Aquilla James Dyess
Colonel Merritt Austin Edson
Captain Henry Talmage Elrod
Private First Class Harold Glenn Epperson
Corporal John Peter Fardy
Captain Richard Eugene Fleming
Captain Joseph Jacob Foss
Private First Class William Adelbert Foster
Major Robert Edward Galer
Private First Class Harold Gonsalves
Sergeant Ross Franklin Gray
Private First Class Henry Gurke
Private Dale Merlin Hansen
First Lieutenant Robert Murray Hanson
Sergeant William George Harrell
Corporal Louis James Hauge, Jr.
First Lieutenant William Deane Hawkins
Private First Class Arthur J. Jackson
Private First Class Douglas Thomas Jacobson
Platoon Sergeant Joseph Rodolph Julian
Sergeant Elbert Luther Kinser
Private First Class Richard Edward Kraus
Private First Class James Dennis La Belle
Second Lieutenant John Harold Leims
Private First Class Jacklyn Harrell Lucas
First Lieutenant Jack Lummus
First Lieutenant Harry Linn Martin
Private First Class Leonard Foster Mason
Gunnery Sergeant Robert Howard McCard
Captain Joseph Jeremiah McCarthy
Private Robert Miller McTureous, Jr.
Private First Class John Dury New
Sergeant Robert Allen Owens
Private Joseph William Ozbourn
Platoon Sergeant Mitchell Paige
Private First Class Wesley Phelps
Private George Phillips
Captain Everett Parker Pope
First Lieutenant John Vincent Power
Private First Class Charles Howard Roan
First Lieutenant Carlton Robert Rouh
Private First Class Donald Jack Ruhl
Private First Class Albert Earnest Schwab
Colonel David Monroe Shoup
Private Franklin Earl Sigler
Private First Class Luther Skaggs, Jr.
Major John Lucian Smith
Private Richard Keith Sorenson
Corporal Tony Stein
First Lieutenant James Elms Swett
Sergeant Herbert Joseph Thomas
Sergeant Clyde A. Thomason
Sergeant Grant Frederick Timmerman
Major General Alexander Archer Vandegrift
First Lieutenant Kenneth Ambrose Walsh
Gunnery Sergeant William Gary Walsh
Private Wilson Douglas Watson
Corporal Hershel Woodrow Williams
Captain Louis Hugh Wilson, Jr.
Private First Class Robert Lee Wilson
Private First Class Frank Peter Witek