_U.S. deaths as of Dec. 15, 2011: 4,487, according to the Pentagon.
_Confirmed U.S. military wounded (hostile) as of Nov. 29, 2011: 31,921.
_Confirmed U.S. military wounded (non-hostile, using medical air transport) as of Oct. 31, 2011: 40,350
_Deaths of civilian employees of U.S. government contractors as of Sept. 30, 2011: More than 2,097.
_Iraqi deaths as of Nov. 30, 2011 from war-related violence, according to Iraq Body Count: At least 103,775.
_Assassinated Iraqi academics as of Aug. 25, 2011: 464.
_Journalists killed on assignment as of Nov. 30, 2011: 174.
_More than $805 billion as of Nov. 30, 2011, according to the National Priorities Project.
_October 2007: U.S. troop levels reach 170,000 at peak of buildup, with total international troop strength at 182,000.
_July 2009: International troop levels in Iraq drop to 135,000.
_October 2011: U.S. troop strength at 39,000.
_Countries responsible for leading operations in three of seven security sectors in Iraq as of May 2007: Britain, Poland and South Korea.
_Countries providing troops as of May 2007: 25.
_Coalition countries who left Iraq in 2009: 6
SIZE OF IRAQI SECURITY FORCES (includes police, national guard, armed forces and border patrol):
_May 2003: Roughly 7,000-9,000
_March 2011: 670,000
_Prewar: 2.58 million barrels per day.
_July 29, 2011: 2.37 million barrels per day.
_Prewar nationwide: 3,958 megawatts. Hours per day (estimated): 4-8.
_July 29, 2011: Nationwide: 6,990 megawatts. Hours per day: not available.
_Prewar cell phones: 80,000.
_October 2011: An estimated 23 million, served by three carriers.
Prewar: 12.9 million people had potable water.
Sept. 22, 2011: Approximately 24 million people have potable water (majority in urban areas).
_Prewar: 6.2 million people served.
_Sept. 22, 2011: Approximately 20 million people served (majority in urban areas).
_August 2011: Approximately 1.3 million people are currently displaced inside Iraq.
_Prewar: 500,000 Iraqis living abroad.
_July 2011: Approximately 1 million Iraqis, mainly in Syria and Jordan.
Sources: Associated Press, U.S. State Department, U.S. Defense Department, Special Inspector General for Iraq Reconstruction, The Brookings Institution, Iraq Body Count, U.N. Assistance Mission for Iraq, U.N. High Commission for Refugees, Committee to Protect Journalists, National Priorities Project, U.S. Government Accountability Office, GlobalSecurity.org, ProCon.org.