This is the official count supplied by the Department of Defense.  It includes no mercenary (contract military) deaths or injuries, much less civilian deaths, injuries or displacements.

OPERATION IRAQI FREEDOM (OIF) U.S. CASUALTY STATUS
AS OF:   March 7, 2008, 10 a.m. EST

OIF U.S. Military Casualties           Total                   Non-                  WIA             WIA
by Phase                                        Deaths   KIA       Hostile               RTD             Not RTD

Combat Operations -
19 Mar 03 thru 30 Apr 03                      139      109          30                    116                426

Post Combat Ops -
1 May thru Present                            3,827   3,121        706                16,095            12,680

OIF U.S. DoD Civilian
Casualties                                               8         7           1

Totals                                               3,974   3,237       737                 16,211            13,109

 KIA – Killed in Action;  WIA – Wounded in Action;  RTD – Returned to Duty