Estimates appear to vary widely, with most in the hundreds of thousands range, but there's one estimate as high as a million deaths in the Iraq War (from the linked page):
"Opinion Research Business (ORB) poll conducted August 12–19, 2007, estimated 1,033,000 violent deaths due to the Iraq War. The range given was 946,000 to 1,120,000 deaths. A nationally representative sample of approximately 2,000 Iraqi adults answered whether any members of their household (living under their roof) were killed due to the Iraq War. 22% of the respondents had lost one or more household members. ORB reported that "48% died from a gunshot wound, 20% from the impact of a car bomb, 9% from aerial bombardment, 6% as a result of an accident and 6% from another blast/ordnance."
Estimates appear to vary widely, with most in the hundreds of thousands range, but there's one estimate as high as a million deaths in the Iraq War (from the linked page):
"Opinion Research Business (ORB) poll conducted August 12–19, 2007, estimated 1,033,000 violent deaths due to the Iraq War. The range given was 946,000 to 1,120,000 deaths. A nationally representative sample of approximately 2,000 Iraqi adults answered whether any members of their household (living under their roof) were killed due to the Iraq War. 22% of the respondents had lost one or more household members. ORB reported that "48% died from a gunshot wound, 20% from the impact of a car bomb, 9% from aerial bombardment, 6% as a result of an accident and 6% from another blast/ordnance."
(full Wikipedia page on this survey: https://en.wikipedia.org/wiki/ORB_survey_of_Iraq_War_casualt...)