"The number of Iraqis killed, however, is much harder to pin down, and that uncertainty is perhaps reflected in Americans' tendency to lowball the Iraqi death toll by tens of thousands.

Iraqi civilian deaths are estimated at more than 54,000 and could be much higher; some unofficial estimates range into the hundreds of thousands. The U.N. Assistance Mission for Iraq reports more than 34,000 deaths in 2006 alone."

http://www.usatoday.com/news/nation/2007-02-24-iraqi-deaths-poll_x.htm?csp=34